Guaranteed starters are a dying breed and the boundaries between first teamers and reserves is getting thinner at every season. The Martial thing was regrettable (although Rashford is getting loads of games), Shaw had been crap under 2 managers and there's nothing TFM/Periera/Tuanzebe had done at other clubs that remotely suggest that they are United level apart of course the hype at redcafe.
Mou is no Wenger but his reputation of only relying on old players is unfair at least in terms at United. In my opinion he had balanced things up by bringing a mix of youths (Lindelof, Bailly, Lukaku, Dalot, Pogba) and experienced talent (Matic, Mkhitaryan and Sanchez). This ideology is in line to that of his chief scout Ribalta who pretty much did the same thing at Juventus.
I agree with such ideology hence why I don't want Bale. We've got enough experience in midfield with Matic, Sanchez, Mata, Failini, Lingard and Herrera. Ah and I almost forgot. Bale is a crock on huge salaries. We had enough bad experiences with crocks (Bastian, Owen Hargreaves, Micheal Owen, Louis Saha etc) so lets learn our lessons.
So to answer your question, I prefer we get a younger winger whom we can develop. Someone like Martins, Thuavin or Suso.