yeah, Andreas, you think its that easy to go and adopt. You go and try it ; Adopting is nearly more difficult than birthing yourself naturally or being scientifically helped for that, on every level of the process. yep, you need to go study what adoption asks for, what it really is. Its not like going into a shop , because today you concluded its the best thing to do "for the world" . the guys at the other end will ask you much more , in practical terms, than just your point of view about having or not children. And that is exactly the same reason why i tell you your question is quite immature in fact , i mean immature in the sense that you seem to not have had enough reallife experience with what wisdom , and what compassion is, and what children are. thus you play around the mathematical axiom actually in your head. My father would say that you address the question clearly as a youngster and are not mature enough to access the real debate in question. wisdom is one thing, but its all cold and dangerous. A thieve got to have wisdom to do his job.
Adopting is not a given easy fact. you seem to think about life and death, as if you where not concerned or as if anything you decide you can have or not will happen just because you perfectly know the theory and needs only action/snap of finger; but the map is not the territory

thus i say you lack true wisdom and true compassion; Here, you ask a question which has no practical life value, even if you got an answer, what will you do with it ? (yes, not having children, i understood ^^ )
it seems obvious you are in deep doubts about why people have children in this frigthening world. you'll get it with experience, true life experience, not disconnected, online theorical experience and debates without going experimenting "life and death" of human beings , rubbing your face with its gravel
As for the bodhisatva (beeing a good bodhisatva is, by the way, a tautology) , i think you don't understand what it is otherwise you got to recontext your question (and "believe" ^^ ) ; By telling me this, you de-facto have to admit that rebirth is then mandatory .. you got to first liberate yourself, then decide to go Bodhisatva, and then this is when you will need other women and men to copulate so one of these couples gives you the possibility to come back again as a bodhistava and continue helping others, and again another rebirth and so on. oh you might maybe tell me one can be a Bodhisatva only for this life and then stop .. this is not bodhisatva, this is selfcentered egocentrical "I" flawed mindset . so either you are debatting with a strong I , or you admit there is no I , then the question becomes irrelevant.
Again, if Bodhisatva is a possible way according to you, then you can't ask for an answer for your question AND precising that you want that answer in a non believing context. If you believe one can and one should be a Bodhisatva, then the question is again futile, non relevant, has no straight given answer, its case by case . A Bodhisatva will help relentlessly, with no discrimination or general view of how the world should be to conduct himself, or how to help anyone (by adopting or giving /helping giving birth and he might as well adopt AND give/help birthing) . It will only be on case by case basis, driven by the 2 dharma wings : Wisdom (pre-plato, plato, and friends..) AND Compassion ; without one or the other .. you are bound to failure, either suicide or deep attachment ; no liberation on the horizon at all.
It is not a question of optimist or pessimist , either side is already a non-free position thus non usefull and non true.
the true position would be : lets have a child if it is wise AND compassionnate, lets adopt a child if it is wise AND compassionate, whatever happens, we will manage, it not only my little self, my little liberation goal; In any ways, there will be suffering. thats certain; now its up to your intent and action (karma again) .. wanna just get rid of suffering , for "yourself"? , then you will never get rid of it. neither would the rest of the world if we all acted the same .. so much for lowering suffering in the world, result would be opposit

Because in the end is the intent and karma, no one else is deciding anything (only the non-free thinks he is certain deciding correctly or not something.. aka needs mortal "tangible/earthly logic" reasons ) the question is thus futile again in all ways. why then even ask the question ; its obvious ; if the goal is ending my little's me suffering only, yes, why bother have childs, why bother have sex, why even bother eat , or pay attention not to be run over by a car. ; So you can die quickest possible and leave room to other truely suffering but who will still be ok to help each other get out of this all together. I tell you, the way you conduct your philosophy and debate around some unfathomably deep question like this one (in fact, the deepest, with death) , reveals profondly how self centered and far away from liberation you are; you are totally grasping onto "personnaly not suffering anymore" and "the others should think more like me" , a deeply flawed view, how can you then believe your logic is correct and practically appliable in this world
Having or not a child, is as everything else.. its dependent arizing .. today, its not arising , it might never; but thinking about it for the other human beings is already denying them the choice, or judging them, because of your flawed view about life and death and because you recently are stuck with the simplistic idea that if everyone stopped have children this would lower suffering in the world. It would not

Oh such a pity this is not my native language, i have some frustration now , arhh , i know you will try sweeping the whole thing by getting back to a 0 1 0 1 young speech .. but truth is you waste precious time thinking empiricaly like you do .. or are you in the real position of deciding if you should go for it ?

I could just develop for hours but my time is up, i got to stop give compassion in this virtual place for now, and instead go give some to my 8 month pregnant wife who is really suffering for a child which is about to come =)
Same could go for you, stop asking irrelevant questions and go help some kid, or have one to experience what it is , then you can come back and maybe answer the question with great wisdom and great compassion
ps: so , how old are you ? =)