#Bitcoin can also be rolled back. Any block can be agreed to be the last honest block and a group of miners can pick up from there.
Discussion
It can, odds?
In 2010, Satoshi Nakamoto discussed the potential threat of quantum computers to Bitcoin's security in a BitcoinTalk forum post. He suggested that if SHA-256 became completely broken, the community could agree on the honest blockchain before the trouble started, lock it in, and continue with a new hash function.
Same thing we are talking about here.
It’s all about consensus
No consensus here
That would be so devestating to the miners who forked off. I'd love to see it though and for them to get rekt beyond comprehension. Complete annihilation before they just slink back to the mainchain and pick up where we left off.