Hmm... I think IPv6 might be actually better. Apple for example will generate and use a temporary IPv6 which changes every few hours to protect your privacy.
I read many responses mentioning you should have kids to 'pass on your genes' so potentially your offspring can be a 'better you' and improve the world.
I would argue that adoption could be a good alternative. When adopting, you are potentially doing all this without actually contributing to the world population increase.
Also, I think RMS made a respectable choice, and probably indeed contributed more to society than if he would have had kids. Not having kids is IMHO probably a harder decision than actually having kids.