In a scenario where you have a powerful enough quantum computer and are able to break the encryption you can access any wallet (I.e. the system would be done, and the value would be zero).
It's a dumb analysis of the situation that ignores what would actually happen:
A new wallet cert would be created that uses more bits. Enough that a brute force even with a quantum CPU would take too long. Then you transfer the funds to the new wallet. Abandoned wallets might be claimed during this transition but overall the deflationary trend of btc won't really be effected long term.
I think having Trump whisper in your ear before the next Truth Social post is the least effort way to win at Crypto. Inventing a viable quantum computer seems like way too much effort for the bros.
In a scenario where you have a powerful enough quantum computer and are able to break the encryption you can access any wallet (I.e. the system would be done, and the value would be zero).