Well yeah, that's also an issue. It's also possible that shor's is realized sooner than we're predicting, and announced suddenly, so before Bitcoin can propagate whatever is selected in the end, and that is the end of Bitcoin more or less, not just nostr. (There is currently a race condition between bitcoin core and a quantum machine that can realise shor's.) I'm optimistic that a Nostr 2.0 will come out and be much better than this one, but a complete from-scratch do-over. I'm not optimistic that Nostr 1.0 can be "patched" by just swapping out keys. Every dev here has a sacred list of hard-fork-requiring things that, if there is going to be a hard fork for quantum or whatever else, then those things MUST also be in the hard fork. In other words the next fork might be the only hard fork to ever occurs and those hard-fork requiring things will just have to be in it, now or never.