Even setting aside Carpenter, who probably needs to move up a level, you still have Victor Reyes and Akil Baddoo, on top of Hill/Cameron who are still in the bigs, who will eventually get healthy and need spots to play. Whoever isn't on the 26 man roster in that competition will need playing time. Not to mention the org seems interested in giving Clemens/Davis reps in the outfield as well.
Folks like Robson or Dylan Rosa, seems like they may be living on borrowed time, granted injuries have a way of taking care of these personnel things and ensuring guys have spots.