Yeah I'm currently in the URSF camp for drivechain, because I think its that serious.
Discussion
In general, forks without consensus, are a bad idea, IMHO. Defending against these requires some thought.
URSF?
User Rejected Soft Fork.
Whereas with a UASF (user activated soft fork) where your node rejects blocks that don't indicate the miner made the upgrade, in a URSF, your node rejects blocks that indicate a miner has made the upgrade.
There are risks to doing things this way, but I do think the risk drive chains pose justify that level of action.