How much of human intelligence do you think depends on language?

Personally, I'd wager quite a lot. Especially looking at cases where children were deprived of it during developmental stages.

Language accelerated human intelligence.

And then it was only when we had writing to have compounding effects of language that human intelligence really started to blow up.

So yes, maybe we won't have AI that can look at sticks and figure out how to start a fire from them after a few hundred thousand years of being around them.

But maybe that's not the important and valuable part of collective human intelligence.