I can't see Pep leaving any time soon apart from health reasons. He is vocal - and usually without prompting - about his love for the club, the ownership, the players and fans and, more still, what the ownership is trying to accomplish (as if it is more - and it most certainly is - than just winning).
Having said that, as much as I would hate it, if we win the ***************** (redacted for anti-jinx purposes) and he wanted to move on to a new / different challenge I would send him off with well-wishes. I think he has become so firmly enmeshed with the culture of City that no matter where he goes or what he does he will always be "family."