I fully agree with you. Superconductor miners would definitely produce more hashes than their counterparts.
My "concern" (if you can even call it that) is simply economics of energy markets. The price per kw/h depends largely on where you mine.
Home mining typically isn't the most profitable, but you can justify it today if you use the heat your ASIC produces productively. Like heating your house, pool, or something else you would have been paying to heat anyways.
Without heat as a byproduct, miners who co-locate to cheaper energy sources are simply more profitable. The incentives shift further away from mining at home.