Ah, then yeah, in that case, it'd be basically over. Maybe large exchanges would try to step in to make a fresh chain based on their combined account data, and

Ah, then yeah, in that case, it'd be basically over. Maybe large exchanges would try to step in to make a fresh chain based on their combined account data, and just drop the people relying on self-custody. But I doubt the market would go for it - the uncertainty would crash it hard enough that it would never recover.