I tend to think of it in terms of evolutionary pressure; either complex societies begin to develop communism or pretty soon complex societies won't be possible anymore, given how we've been interacting with the natural world. If it is the former, it won't be pretty. History rarely develops nicely. And it won't be fast. It will take generations, as people figure out how to organize and balance industrial economy with our triaged ecology.

If it's the latter... well, I suppose the people that come after will have an easier time organizing themselves? That's not... a particularly comforting thought. I'm an industrialized, computerize ape. You can take me out of the complex society, but you can't take the complex society out of me. I'd like to see what our complex societies are capable of, when all that amazing engineering and knowledge and labor is unshackled from the profit-motive. There is so much potential in what we have, it seems a tragedy that we might not see what it can become.