Its all pretty standard fare at this point. When deployed correctly, Fellaini is as good as any other CM in the squad. He offers something different, and can be pushed forwards as a last resort. He isnt a playmaker, he is a box to box player, although plenty of the fans are unlikely to ever grasp this point. I do not think Mourinho will sell him, similarly I wasnt surprised that LVG didnt sell him.
Managers - the people who are paid a lot of money to understand football and win matches - understand that Fellaini is in fact a good player. This is why Moyes brought him to United, why LVG and Mourinho appear to be happy to keep him in and around the first team, and why he is always close to first choice in an extremely talented Belgium squad on the international stage. Those inside the game get it, it is just a large proportion of the fans that will never be convinced. Fortunately, Fellaini has shown that unlike several players, he is thick skinned enough that the abuse doesnt bother him.
Not even I can defend the new hair though.