A lot of folks, both fans & spectators as well as racers and crew chiefs themselves stated rather succinctly that it wouldn't take very long for the crew chiefs to "shorten the wick" and begin hurting parts at or prior to 1,000'. Nobody should be surprised that we're seeing that today - If you are, you either weren't around when they decided to go 1,000' racing or you weren't paying attention.
Furthermore, the majority of teams that are blowing things up are using second hard parts because it's what they can afford - Not all, mind you, but most. (Beckman at the World Finals comes immediately to mind, but look at Lesenko, Diehl, etc.) Anyway, the low budget teams are forced to push the performance envelope using equipment that the high dollar teams weren't willing to push with just to run hard enough to get in the show and be mildly competitive. Again, we shouldn't be surprised when nitro motors with second hand parts go boom!
Lastly, you suggest decreasing performance and in the same breath refer to them as the "premier classes." NHRA is in a very tough spot and I don't envy them. First of all, if they force lesser performance on the fuel cars they create a huge expense for everyone because a lot of the equipment they're currently using will be obsolete. Then, who do they sell it too? It's useless - nobody will buy it. Also, where do the aforementioned low-budget teams buy their second hand stuff - there won't be any, at least initially. And then there's the TAD/TAFC dilemma - Are you going to decrease performance in the TAD & TAFC classes too? Assuming decreased performance in the fuel cars, it's not a stretch to think that at some point TAD/TAFC may be almost as quick and fast as the "premier classes" and we definitely don't want that, do we? And to suggest decreasing their performance too would be ridiculous (see cost effect above).
Look, when you're using CH3NO2 as your fuel source, things are sometimes going to go BOOM, whether you're using new stuff or old - it's a fact of NHRA racing.