The MPL's at CP were never meant to be upgraded. What is happening now is a result of CP's doing, not anyone else.
CP management (if you can call them that) only wanted warm bodies to fill the right seat since they couldn't figure a way around it. The MPL fit the bill.
Now since CP feels they "own" the MPL's there is no need to do anything with them except continue the abuse. CP has so poorly trained these MPL's they are confident they can't be employed anywhere else.
Sorry, the truth hurts.