I don't think it's that big an issue, like you said, other pitchers have stepped up, and we're going to be shortening the rotation for the postseason anyhow. Looks like Price, Porcello and Buchholz of all people, with E-Rod as the #4 man if we need one. Buchholz seems to have saved his best for last, and the timing for his sudden surge of competence couldn't possibly be better.
But remember we didn't just get Pomeranz for this year. Next year and the year after, we still have control of this guy, and he'll have a year's experience as a full time SP under his belt and have a good idea how to train to be able to bear the workload better next season. The trade for Pomeranz wasn't a rental, it was an intermediate-term play to help us get to October and strengthen our rotation for the near future. And it was a move that I think in the end we'll be grateful for, he seems extremely talented, if he can get his arm fully stretched out for full season starting and I think with the right conditioning he can, others have done it (see also: Arroyo, Bronson), get a good offseason training program going and the pitcher has a good idea what to expect, he should be fine over the next 2 years, that's more important than these last couple months overall IMHO,