The issue here is different from a name or so.
This year Di Maria couldn't cope with LVG's philosophy and players like Young and Mata were above him in the pecking order, and as much as we like him, we all know that Di Maria was poor last season. I'm rude enough because someone with his talent and his price should have done better, so he was poor.
We know that he can produce at United, but this is only thinking about the player. What about the team ? Will he be able to do what he didn't last year for LVG ?
In a hand, you have issues on and off the field at Manchester, and in an other hand you have the possibility to leave and find another big club. You doing big efforts or you leave.
I think that he's more down the second thing. And to be honest, if Paris gives us 75-80M€ for him, I guess that Woody will be there to sell him and try to recruit somebody else.
Then who ? Do we really need to buy another winger if he leaves, or can we buy a striker ? (Cavani ? I hate him but there were talks), Kane for 50M, or trying to force Muller or going back to Bale ? .... Maybe another top midfielder like Koke, Vidal...
Di Maria was not a starter last year when we finished for. We all know that if he manages to come in this team he will do great thing, but the fact is that PSG can propose a huge offer for a sub