I agree with you there way to many squad players only about 6 of are squad could even think about geeting in the Mancs or Chelskis team. We need to sell as many as we can now while we have the money to replace them with top quality players.
Other clubs in the world followed that policy of "I have fresh money, let's buy top class players" before, Real Madrid and their 4 years without winning silverware Galacticos era is a good example, or Chelsea and their I'll waste ridiculous amounts of money for just good players and not winning the CL era.
We can't do the same mistake. And I don't think Rafa will do it, I'm sure he'll buy now what he wants at the moment he wants (or at least it will be easier for him), but I don't see him getting rid of a lot of players this summer, IMHO.