We should keep him, especially after the season he's been having.
We need all the quality and depth we can get/afford for next season.
Giovinco and Vucinic fighting for the LWF role, Higuain/Cavani and Quag for the main striker role, with Ramirez and Pepe as our RWFs and we are set. Keep Del Piero for backup, and experience, and acquire Destro for youth and versatility. Goodbye Matri, and ship Borriello back to where he came from. That's how I'd conduct our mercato in the attacking department.