Pep once said that if he went to Serie A he'd take the Brescia job. That'd be interesting. He was a player there near the end of his career and he had a real affinity for the club.
C'mon, he isn't going to any club in which the odds/finances aren't stacked completely in his favour.
The original post is really interesting because there is no really obvious place for him to go. He's already done:
Barca - stacked with best players and one of two richest clubs in Spain
Bayern - stacked with best players in the Bundesliga and far and away the richest club in Germany.
Man City - stacked with many of the best players in the EPL, by far the deepest squad and, until Newcastle changed owners, the richest club in England.
PSG? I don't see it interesting him.
Serie A? No clubs there with the money to be a really high spender.
I doubt he would go to another club in England. It looks like Saudi or a National Team would be a most likely destination.