They can start the season with Velasquez as the 5th starter, and skip him at times the first couple months.
Arrieta should be much better this year, bone spurs aren't TJ surgery, and he's in a contract year, playing for his last deal.
While the Lehigh pitchers were disappointing last year, they'll have good depth to start the year with Howard, Jones, Seabold, DLS, and a bunch of bullpen candidates like Brogdon.
The Phillies need to develop some young pitchers to provide depth at the back of the rotation and in the bullpen.
They're pretty much tapped out in free agency with the Wheeler signing, and they want to extend Realmuto.
Hopefully, they've improved their minor league coaching, because while one can't expect miracles, it would be nice to develop #4/#5 starters and some middle relievers, and not have to pay $5-10M a piece to fill out a roster.