No offense but United really aren't looking like winning anything any time soon. Top 4 is certainly not a guarantee next season for you, PL will be very competitive, especially if Ronaldo leaves also. The only pull really is ten Hag and I don't believe that's as important as made out, I don't care if he wished him well in a video. Players will look out for their own interests first and foremost. I honestly believe had a CL club seriously come in for him, he'd be gone already.
As for how Barca are treating him, it's drama hyped up by the media who have nothing else to talk about. Where is the evidence he is being bullied? Gary Neville is a clown, most of your fanbase already came to that conclusion, he has no idea what's going on behind the scenes, nor do any of us yet big bad Barca are a disgrace! Oh the horror of it all.
The new wage cap at Barca applies to EVERY player. Nobody will be getting the ridiculous Messi style wages anymore, it was unsustainable. Frenkie would of known this before the transfer saga; lower your wages to fall in line with the new structure or you leave. MAYBE Frenkie rejected that early on hence the wheels were put in motion to sell him.
If the 17mil deferred wages was a legal obligation for Barca to pay, they would pay it. We have money to blow, that's no longer the issue it's the wages. 17mil is nothing if it means saving his ridiculous wages. The deferred wages shit is another misinformation; IF Frenkie has a case, join United and sue us. Come out and tell the world how evil Barca are treating you badly, staying quiet makes no sense, Barca won't be paying. I don't believe this is all about money or Frenkie being greedy at all btw. United would probably make him the highest paid player in the PL or at least equal if he joins you, the player doesn't want to leave his dream club.
In summary, I think he'll leave still. His position at Barca is impossible and no player is going to risk a World cup year in a hostile environment at 25 years old, entering his prime, just to stick it to a club. IF it truly is about deferred wages being legally owed, he can leave now and sue Barcelona. Simple.