Barca should have been able to keep Guardiola by replacing some of the older players. The team got stale and lost their hunger because they won everything there was to win. When you reach that point, you have to move some players on and bring in new, hungry blood. They couldn't cut the cord with Puyol, Alves et al so it was always going to be difficult for a new manager to motivate the team to play as they did. That's why new defenders are a must in the summer, and it'll be good that Valdés and Puyol leave. The dressing room will have new energy.