A world without human intelligence?

[Regina]

Eventually if you look at chimps and monkeys are now in the stone age if we weren't around they would the dominant species
if early man would have died out.

I don't really agree with this view. The only thing non-human apes have that give them any edge other animals is (very limited) ability to pick up and weild tools. Even then, their ability to do so is very rudimentary and disorganised compared to what even Old Stone Age hominids were doing, and they can't communicate through spoken language or form more sophisticated and organised tribal groups either. Unless they develop those skills (which would take millions of years, as it did for our ancestors), they'll never reach a true Stone Age, forget surpass it and move onto real civilisation.

They'll have entered the Stone Age when they're regularly lighting fires and proactively creating and using tools to hunt and gather food (in organised groups). We've seen this in one-off situations but not enough to say it's a widespread new-ape Stone Age.