For automatic triggers you need SOME way to combat extreme unfairness (like something calamity induced for example), but any way i can see to fairly do that doesnt really work in a 2 party system. A multiparty system would be better protected against voting with the party vs voting according to your morals, or whatever you would call what is happening over there.

I guess in the current state of the dysfunctional US legislative + judicial system that unfairness would be a small price to pay.