Islan Flyer, on the face of it, what you say would seem to make sense. Unfortunately there is no way near the space within training departments to accomodate all the older guys who want to stay in the game.
I work for a big LCC in Europe and they choose to staff the training department with 1000 Hr F/O's as SFI's. Once they have a command, they make them TRI's. Where is all of this valuable wisdome and experience coming from in our very large training department? I think they are probably cheap though.