Mourinho will run his favorites into the ground and when they inevitably burn out out or go down with a heavy injury, all the pressure will be on the young guys to produce instantly. It's very annoying how he can never sub his preferred no. 9 no matter how bad they are playing or if the game is won, as it happened with Zlatan and this season with Lukaku. We have massive talents for the future who prefer to play as strikers but he refuses to give them chances at the position even as subs. Nurturing talent isn't his strong suit to say the least. He has had my support on a lot of things but selling Martial will be a turning point, one of the main reasons I was excited for Mourinho as United manager was the thought that he wanted to use the opportunity to show he can build a team for the long term, and selling the best young talent we've had in over a decade is certainly not in line with that thought. It will be an incredibly selfish decision for his short term gain while the club loses for the long term. Not to mention the aging galactico or workhorse he will replace Martial with will need time to integrate into the team and may bring more disruption than cohesion, with the team failing to deliver even on the short term success. I obviously hope the best for the club after whatever Mourinho does, but selling Martial will be a huge gamble he doesn't need to take that potentially has more downside than upside for the club.