Wouldn't be the worst thing for Man Utd imo, would enable them to build a more balanced side. Pogba almost plays a non-role, not quite defensive, not entirely offensive and it hinders them I think. With Fred looking good, and the likes of Matic, Herrera, Pereira & Mctominay all more defensively minded, they would benefit from selling Pogba and bringing in a proper number 10, having 2 dedicated defensive midfielders and a more defined attacking 4.
--------------Fred---Matic-------------
Sanchez-------New 10--------Rashford
-----------------Lukaku----------------
Of all the players in world football that would complete that team you got there, I'd have Dele Alli in that 10 role.