I do like that you mention diminishing returns, because we are hitting them in building out all the external requirements for competing at the frontier. Even if model performance scales linearly with energy input, the top labs are now competing with other uses for that energy.
How far are we willing to go as a nation (and as a species) to prove out the scaling laws? Are we willing to sacrifice our industrial base? Would we rather train models or smelt aluminum?
It's unlikely the USA would be granted an exclusive patent for the atomic bomb given the well-established existence of prior-art in the form of nuclear fission on the sun.
(I actually appreciated your analogy, despite my lark)