Why would Guardiola move on?

Question

Pep Guardiola has been rumoured to want to leave the Nou Camp at the end of the season – does this really make any sense?

The Barcelona manager guided his side to an historic treble last season and is in charge of one of the best and most popular teams in the world. It would make perfect sense for the former Barca midfielder to stay put - it suits everyone associated with the club - so why on earth would he leave?