Power feed issues are more solvable than the really fancy chip issues right now, from what it sounds like.If you want it to pull 5000w of power for a single GPU, sure.
Replacing some fancier chips that need hyperspecialize equipment to make, and a hypercompetent workforce to maintain, with some micro-vacuum-tubes for some purposes seems like a decent stop gap if the roadblocks to building the newest, fanciest chips are so severe.