There is no doubt that Bengio is both very smart and a decent mensch. And he can still be wrong about how advanced "AI" can become. Wrong in the way any deeply learned scientist may simply have wrong intuitions.

Now, who can say what can happen in 100 years? But first we need to (collectively) get to that age, which means solving known and imminent problems, which means building the communication tools that will support problem solving at scales we havent done anytime before.

Clarke's First Law:
When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.

Asimov's corollary:
When, however, the lay public rallies round an idea that is denounced by distinguished but elderly scientists and supports that idea with great fervour and emotion – the distinguished but elderly scientists are then, after all, probably right.