Pep Guardiola will leave FC Barcelona...eventually. He's said so himself: Being at a club more than one year at a time is something very difficult.
So, basically, what Pep is trying to say is he'll be a Barça coach as long as the players, the fans and the club management are comfortable with him. The minute that changes though, it's "Find a coach for the Camp Nou bench" all over again.
If we could ask Laporta if he expected Pep to win two Champions Leagues in his first three years, I'm sure he'd say he didn't expect that kind of success. Especially from a man that had zero games coached in first-level football.
That said, what are the characteristics that made Pep successful?
To me, there are three intangibles that made Guardiola the perfect candidate: faith in the 4-3-3 playing style, offensive and ball-possession mentality and leadership off the field.
This list will take those three values as the benchmark on what to look for to find Josep's eventual possible replacements.