It's more likely we will switch to different cryptography though, which likely to be quantum resistant while remain compact in size.
Instead we use an entirely different algorithm (ie. version 2).
Do we also have a plan how we will switch the old addresses to the secure addresses? Transfer the coins?
Let's assume these guys
Pollard's kangaroo ECDLP solver have a very very fast computer and can calculate ECC private keys in the 2^256 range and demonstrate it and reassure us. How would we proceed?