Ideally no, I'd rather take Madrid to the cleaners (£50m or more) and feck him off - but de Gea and Mendes tried to ensure that couldn't happen by not signing an extension for 18 months.
People are saying 'Real and de Gea hold all the cards', but they don't, at all.
Real have a transfer ban from next season, and de Gea is contracted to be a Man Utd player for another season.
So the club could (and I think should) simply say, "you pay what we want or he can leave on a free next season". It's not our problem if that doesn't suit Real - I'm sure Barca or Atletico would gladly take him on a free!
From the player's point of view, he's been pampered here and treated with such love that I doubt having to stay here for 1 more season is that much of a hassle - as I said before, we're in the CL, we've got a better manager than Real and we're spending money.