He's certainly not going to hit the heights he did with Barca, by default because the odds of creating another "best team ever" are pretty slim.
I think it's important he finds the right club. I just hope he doesn't end up at somewhere like Chelsea or City, 2-bit clubs with no honour or prestige with a sense of entitlement.
He strikes me as potentially being "project" manager and that's why I think he's suitable for us. I can also see him as Fergie's successor.