If miners refuse to do their job in filtering, there's no reason to leave it up to miners.
Regular participating nodes can refuse to relay blocks with (eg) more than 50% Dice spam.
Let me get this straight: a blockchain fork caused by the fixing of an unknown bug should be fixed ASAP. On the other hand the blockchain should be deliberately forked because not all miners agree with you?
This topic has nothing to do with blockchain forking, period.
One faction in the network refusing to relay valid blocks has no potential to cause a fork?
If it gets big enough, it could cause a soft-fork. But that's a much different/smaller problem than a hardfork, and unlikely to occur (since miners would presumably get their act together before it got to this point).
Edit: The real problem with this idea, is how to coordinate undoing it when/if SD cleans up their service so that it stops flooding.