Nice explanation, thanks. That's a lot of assumptions though.

1. Only bad guys will have quantum to break the encryption an steal your BTC
2. If they can afford to buy or use quantum computer, why would they need to steal your BTC? :-)
3. What if WE create our keys with quantum computer, (aka we have the same tools) then we go back to trillion years to find a solution?

Plus, I think we still have some time to figure this out. Quantum is mind bending and I can't wait for the future to come :-)