Why isn’t there a sustainable economic output? Are you then suggesting that there’s nothing we can do and that we will keep increasing stock prices until the entire ecosystem collapses and we go extinct?
It’s ludicrous to say that we can’t live in a way that is sustainable. We did it for millennia after all. So either we can’t keep growing forever and at some point it will have to stop, or we need less people, or we need to be more efficient with resources or a combination of the above (though the first one is always true).
And funny that you mention that when resources become scarce (and they already are) that we would need to restrict from people that need it because that’s what a “cOmUnISt” society would do. How about we prevent people from hoarding more resources than they could possible use in multiple lifetimes? Because those people are not hypothetical, they exist in the current system and we should definitely do that. If not just for the planet, also because it’s what is fair.