Some of those below Pogba and Marchisio should be replaced for better players, yes. If that means being spoiled, then great, because that's what we need, all the quality we can get to become one of the best out there. Last year we had a midfield miles better than this one. The ones mentioned below Machisio in your list are not starter material for a team aspiring to win the CL.
We need a minimum of one CM, maybe two (but that's just me wanting us to live up to Pogba, Pirlo, Vidal and Marchisio quartet). One will do.