Until Gray and Castillo are traded or leave as FA, which is going to happen before the farm produces enough pitching to backfill the rotation.
Right now, we have two holes in the rotation, Vlad and whoever replaces Miley. Vlad is not very good, maybe passable as a 5th starter, but now he's being asked to do more to pick up the slack for Miley leaving.
I was speaking more of Reed, Lorenzen, and Finnegan being rushed to the majors, not Feldman and Aldeman.