I like your train of thought here. It resonates. However, the fact remains that the new chain still relies on the network effect whereas with just a small amount of nodes and miners the chain is extremely vulnerable and can easily be toppled with just a few million or billion cuck bucks invested into new hardware by any major corporation. I'm sure the fabians know this and are already calculating their next attack. Judo flip your opponent. Use his own momentum against him. Find a way to max extract as many users from the legacy network as possible, making it unreasonably expensive to "buy the whole network". What better way than an eye-popping new upgrade that comforts the average pleb by relieving the fear of the looming threat of quantum hiding in their closet waiting to strike their public address.

Keep in mind, I've heard rumors that core is already working on quantum proofing. If core releases the upgrade first, that damns the possibility of new and existing users to make the switch and strategy can effectively purchase all of blake2bcoin with a single card swipe. Just game theory. Often the element of surprise wins the war, especially if you have the moral advantage.