In theory we could. Everything rarely goes right though. There are always unexpected setbacks and progression. We could also finish the year with a guy like Romero in the AAA rotation as well. I expect him to bounce back, but it is just an example of what "could" happen.
I would say AA and AAA still look quite thin, but there is reason to believe that will change in a year or 2.
AAA is thin right now without Hutch,Drabek and Nolin, but they should be pretty deep by the end of the season. Their hitting will stink, but their pitching should look pretty good again in 12 months..