From a financial standpoint, Wedding Singer won't last much longer and shouldn't.
However, I had much more fun at TWS than I did all the times I have seen WICKED.
If we are basing closings on artistic merit alone, there are a slew of shows that should close before TWS does:
Phantom
Beauty and Beast
Those two come to mind rather quickly...
PS - Just because you don't like a show doesn't mean others don't, and just because you don't like a show, doesn't mean it should close...