Yeah I think the Eagles are in pretty good shape for next year. Most of their players should return, they are really only looking at losing a few players: Chad Lewis, Jon Runyan, Jermane Mayberry, Corey Simon, and Jeremiah Trotter. All good players, but besides Simon and maybe Trotter, none are really essential to their Super Bowl run.
Of those listed, Simon was probably had the least impact in helping them get there, or at least that's my take from the Philly games I saw. Trotter was probably the biggest help, as when he stepped in after the Pitt game, their run defense was much improved. Simon didn't play as well as he could have, and it could be argued that Rayburn was their most consistent DT, and he's a backup IIRC.