That seems very unlikely to me. Certainly LLMs are very compute intensive relative to past applications, but I would find it shocking if they are not nonetheless far more scalable than human labor.
Human beings are incredibly incredibly expensive to "make" into any useful adult thing. I have spent more money just this week just on a single one of the humans who are dependent on me than it would cost me to buy a fully packaged GPU in a box at best buy (and I think that box would actually have multiple GPUs packaged together in it). And I'll do that week after week for many more years. And then it will still be like four more years after that before they're capable of being a teacher.
It was harder to make the first GPU than to make one marginal unit of human teacher, but it's vastly easier to make a marginal unit of GPU.
I'm honestly curious what your mental model is, where you seem to think human labor is cheaper than computer hardware...