His actions during the summer have shown him up for what he really is, but despite all that, he's still a quality player that would massively improve whatever chances we've got at winning something.
Whatever the fee, him going to United would be the worst possible scenario for me. City already have a surplus of attacking quality, so for me, he wouldn't improve them too much, but he'd instantly make United a favorite for the title.
If the board/Wenger really are prepared to lose a significant amount of money, which I'm not convinced they are, and are making Robin see out his contract, I'd be very happy. He should be stripped off the captaincy of course.