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.