I think if we are at the point in technology that a QC can be made that can break SHA256 in a relatively trivial manner
Wrong; quantum computers need to run for 2^80 steps to find a private key mapping to a given 160 bit public key. That will remain infeasible for decades to come.
You are taking my post out of context... the word "if" should clue you in. I know that this is nowhere close to feasible now. Perhaps I should have replaced it with the word when to make it more clear?