Hence I added not always but most times.
I'd suggest that most times, as soon as a player realises he's not getting his move he gets back to business. In fact I can barely think of a time where a player hasn't and a club keeping a player against his wishes has backfired.
Remind me, where is Suarez playing now?
Suarez had a release clause, Coutinho by all accounts doesn't. The season before when Suarez kicked up a fuss and wanted to leave, he didn't get his way. People also forget that Mascherano wanted to join Barca the summer before he did and we point blank refused to sell him too.
We're in a far stronger position in every possible way than we were when we refused to sell Suarez (and Masch) and if it takes anything less than an absolute mental offer (assuming he has no clause) then I'd be stunned.