We already have options that are quantum resistant (just not as well tested as we would like). There will probably be a short intermediate period where qc can b

We already have options that are quantum resistant (just not as well tested as we would like). There will probably be a short intermediate period where qc can break like 128 bit rsa keys but not 4096 bit. The moment that happens everyone will switch to other algos very quickly. Its not like its all that different from the situation with md5 or the current situation with sha1. The world survived. A few people got hacked... but that was very much the exception and mostly software migrated to new algos. Personally i think quantum simulation is a much more interesting application than factoring.