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RE: Witness Statement for @reggaemuffin – Proposing Hardfork Adoption Requirements
We need consensus for blockchain? Not sure what to say there, consensus is how blockchain works.
If one ran 19.x it can either go do it's own chain or disable itself. That is how hard forks work.
I think he means more like when we did the accidental fork a week ago, moving from 20 back to 19.2. In that sense a "rollback" is possible, we have just demonstrated doing it in that event when it happened. We did have to also roll back to a prior checkpoint head block number at the point of the breaking "failure", but it can be done.