Theoretically, these bitcoins exist and can be used after achieving quantum superiority, except unspendable scripts 
But yes you are right determine circulating impossible if we are talking about the actual value.
But yes you are right determine circulating impossible if we are talking about the actual value.Quantum superiority? Man, where do these people learn that names ? Lol.
This makes no sense for so many reasons...
Don't you think cryptography will evaluate together with hardware? Or that if aome privatekeys are breakable, all of them will be as well?
if that "quantum superiority" ever happens, all bitcoins will be lost. And how will you determine which are lost and which are just from people that are holding?