He's Catalan born and bread. His friends are Catalan, his family are Catalan, his club is Barcelona, currently the best team in the world, and he's in the starting 11. He's been there since 1996. Talking about signing him is ridiculous. I've heard some people talk about him saying he'd love to play with Silva. Well its more likely that he was thinking of Silva coming to Barca. Just like Xavi and Messi, that club gave him everything. Made him what he is today and gave him his break. He has no reason, by any obscure stretch of the imagination, for him to move to Man City. He is something money can't buy.
I can't remember who said it but if you somehow pulled it off you would indeed be universally hated except perhaps by Real fans for breaking up whats called the greatest team that ever played through financial power. You'd have effectively "stolen" one of their home grown heroes.
Edit:
As the OP suggested.
And one more thing; how interesting can La Liga be to the likes of Iniesta really? They have two games a season where they actually have to play their best squad and put in an effort, the other 36 games are pretty much just the same old walk in the park.
I watch a lot of Barca and more than often, you don't really see them bother too much and I don't blame then as they don't have to.
If you watch Barcelona they rarely look out of sorts. They love what they're doing whether its a CL final or a standard La Liga game. They love their team mates, their coach, their city, and their league. Its really grasping at straws. Pro footballers want to win, why leave the team that wins everything?