So the bad news is, that mathematically there is probably an upper limit to useful AI scaling.
The good news is, we are still probably an order of magnitude away from that limit.
If you look at the insane power of the leading edge frontier models today, and project that an order of magnitude forward, I'm pretty sure that is beyond what most people can conceive of anyway.
In reality, what the limit means it that is the limit of what all the human language and concepts could encapsulate and has symbols to describe. Including our mathematical language.
Is there anything beyond that? Maybe, but it would be beyond our ability to grasp at a biological level.
And why shouldn't it? A lowly John Deere dozer can certainly move more dirt than any of us. Why shouldn't our AI tools be capable of more intellectual work any of us are capable of? That is why we have tools. To extend beyond what mere hairless monkeys can do themselves.