To be honest, looking his demeanor and some of his comments recently, he very much sounds like he's exhausted with it mentally.
He said recently that won't manage another club side, pretty much because he hasn't got the energy to go into another club and start from scratch implementing his coaching style, structure etc.
He says he wouldn't, but I reckon if he had a year out and the Barca job came back around, I think he'd be tempted for 1 more run at it. Especially where he's at home, with a club that already has his DNA.