To be clear, you are suggesting “huge improvements” in “every intellectual task”?

This is unlikely for the trivial reason that some tasks are roughly saturated. Modest improvements in chess playing ability are likely. Huge improvements probably not. Even more so for arithmetic. We pretty much have that handled.

But the more substantive issue is that intellectual tasks are not all interconnected. Getting significantly better at drawing hands doesn’t usually translate to executive planning or information retrieval.

There’s plenty of room to grow for LLMs in terms of chess playing ability considering chess engines have them beat by around 1500 ELO