Regardless of the different styles, were Utd going to spend £20m+ (which is what Fellaini will cost) on 2 CM's this summer? I'd be surprised.
I presume you mean £20m+
each on two midfielders
to be fair, there are too many warming the bench that need shipping out (either on loan, or sold completely) and with Fletcher's illness still continueing, its silly to include him in the playing squad upto Xmas at the very least (I know some in here would like to see the back of him completely, but imo I think the club should stand by him, but offer him an off-field position once he gets better)
Since last season without having any real effect on the 1st team, Utd could "lose", Scholes (to retirement), Anderson and Fletcher without even thinking to Giggs (who might get a few games as a player/coach but shouldn't be relied on for a massive influence on the season onfield).
Personally Im more than happy to give Powell, Petrucci and Lingard try outs as subs early in the season to see how they go, but two more senior /more experienced players would improve the squad immeasurably.
On top of that the new manager, and very rarely does a new manager come in to a top club and not sign anyone at all (or at least have new signings to the club, even if he didn't chose /sign them himself). Admittedly this is an unusual situation with the last manager retiring rather than being fired, but even so.
Even without selling (and I HOPE Utd DO get rid of some of the chaff), there is Scholes's squad place to fill at the very least.
Just because the CM positions have been a blindspot to Fergie for a number of years, it doesn't automatically mean they will continue to be.