I agree; I don't think there's any reason to assume Jevons paradox won't apply.
> If we have to switch to something like burning the model weights into silicon to continue to make gains
I think that's already being considered semi-seriously [0][1]
[0] https://taalas.com/products/
[1] https://ir.amd.com/news-events/press-releases/detail/1296/am...