To the team's credit they have seemed more willing than in the past to do this. Still, when you given the Correias, Pelfreys, Willinghams, etc. 2 or 3 year deals they no longer serve the role of placeholder. Then they become entrenched and you start to make hard decisions about other players rather than discard them. That's how your roster stays an average of nearly 30 even as you're calling up young players.