He hasn't mastered the change, so I wouldn't count it yet.
Even if he does pick up a 3rd plus pitch, the farm system has 3 possible front end starters (your username obviously) and the resources to add in the FA market.
Delcarmen, Meredith, and Martinez could all prove to be very effective relievers and setup men, but I think SU is their ceiling. I'm concerned about command with all three of these pitchers. Hansen's control, to this point, seems to be in another league. He'll work ahead in the count more often and will allow less free passes. That aspect added to his stuff screams closer to me.