The Laporte situation is really not one to be worried about.
He's got 4 years left on his deal, so Barca or Real can pay up or fuck off, and if he wants to play in the world cup he can't burn bridges and sulk.
Pau Torres is widely considered a lesser (but promising) player and he's on the market for €65m. So the asking price for Laporte is €75m minimum and then they if they scrape the money together, we instantly pick up Torres or Kounde's release clauses, or someone else if the club have another target.
Or they don't offer the money then Laporte has no right to complain. shouldn't have signed a new deal if he wanted to leave. Personally I don't think he'll kick up a fuss this summer at least.
If Barca want him but can't offer cash, we make them hurt with a player for player deal with someone we want, or they piss off.
Playing wise, he's our 3rd choice CB so it's not that disruptive. I actually think he's never been the same player since the knee injury, it cost him pace and he didn't have any to spare. Also Pep trying to keep him happy and rotate the squad really cost us our outstanding defensive record, because we lost the rock solid platform that we had when Dias and Stones played every game together.