It's interesting. It's either an optimistic view or a pessimistic view.

remember the concept of innocent childhood only really took off in the west in Victorian times - think of how much changes in the last generation, the last century, the last 300 years

But then compare the previous 2000 years. Would someone from Plato's era be that unrecognisable to someone from renaissance Florence? (or vice Versa)

What will the next 200 years bring? What about the next 500?

Maybe not humans but instead what we deem as the only thing that's inherent to all of us (humanity?) will be long gone by then.

Yes, but apparently will send birthday cards to each other, too. (?)

It seems quite likely to me, maybe not every trace of human kind but I find it quite difficult to believe we are going to survive climate change in any significant way.