To be quite honest I think the chances of him coming here are better than people make out, in terms of club stature every player dreams of playing for a club like Barca with all its history and players who've worn the shirt. The stumbling block really is transfer fee but would PSG really keep a player who's not committed to the club.
It's runs a bit deeper than him simply being a mercenary too , PSG are a big club in their own right not like he's happy playing for some mid table mediocrity. As well as the fact he's been there for most of his professional career as a footballer bar one or two seasons as a youngster so he's probably very content in Paris.