Yeah I don't like the planet's chances of hanging on to much of the diversity of life we have now but it may well be resilient enough to reboot, whether or not anything with language and our other suite of capacities ever comes along again. But really, would it turn out any better if it did?

But I'm much less optimistic about the USA ever becoming a functional country again. I don't think you can swing to and from being a nation of laws at every election to say nothing of the income inequality. Here at least we are well and truly fucked.

Technology will bail us out.
A few more major crises, like a major war, will bring enough people to their senses to shift momentum.

It is the height of arrogance to suppose that we could cause the end of the world.
The end of our society maybe, the end of our species possibly, but the world will go on, with ot without us.