I don't want to take the thread off topic but this is ridiculous. Gary Neville and Darren Fletcher were both very good players and played regularly in title-winning teams. Their carrers aren't owed to Sir Alex "insisting on them", they were important to the team, Gary especially. Phil Neville, Nicky Butt and John O'Shea were also decent players and would have easily carved up top flight careers for themselves even if they wouldn't have the same medal hauls without United. You're being incredibly harsh on them.
Anyway, I reckon we should definitely sell Memphis if we get the chance. He's got some talent but in Mata, Mkhitaryan and Martial he's also got 3 players who are much more talented than him to compete with in the wide spots. In additin to that, Jesse Lingard (who definitely isn't completely beyond Memphis' reach, talent-wise) provides us with a combination of pace and off the ball movement that Mata and Martial aren't always able to provide on their own, so he's a good tactical option to have, not to mention a dependable rotation option.
Moving Memphis on is the best for both parties. He's young enough to still carve out a good career at another club, plus he needs to be playing regularly. We have better options and don't really need to spend wages on him for a spot that could be occupied by an a academy player if we wished to rotate. If the Everton £40m double bid for him and Schneiderlin is true, we should take it. We make a reasonable amount of money back on players our manager doesn't need, Schneiderlin gets to link up wwith his old boss, Memphis gets to link up with his buddy Lukaku, they both get playing time (probably) and Everton get two good players. It's a win-win-win.