Do you think "El Pep" should continue training Barça?

Pep Guardiola, an ex-football player ant current Barça coach, says that he wants to finish his career as a coach and retire completely. the question is, after four years on the top and achieving to be one of the best football coaches in the world, should he retire?
Most people consider him the best coach Barça has ever had, and if not the best, the second. SO these people think that he should stay a few years more, making both, him an the club, more successful.
On the other hand, some people think that he has done a lot for the team, has already won lots of titles and shouldn't take the risk.
What I think of this is that you actually can't say that a person is  a good coach just because the team he trains wins most of the matches they play, because you can be a very good coach but the payers could be the worst in the world, so your club would loose the matches.In my opinion, he shouldn't take the risk and leave.