The cost argument, although certainly valid, doesnβt touch the fundamentals of a problem π With this logic, we could also reach Mars in a matter of minutes (if we had a near light speed spaceship π¬). Unraveling human genome was originally thought to have an unsolvable complexity, but now the sequencing costs drop 5-10 time every decade.
By the time the cost per qubit reaches at least 10 bucks, the whole community will have migrated to a more secure key standard π