Sanchez isn't that kind of player, are you joking!??!
The guy who has a hissy fit when his teammates play the wrong pass, or got so stroppy after the Bayern loss that Wenger had to drop him?
Sanchez doesn't give a shit about Arsenal, he won't care about City and I don't think he cared about Barcelona either. He simply wants to win, win at all costs, and I think you're completely deluding yourself if you think he won't throw a massive hissy fit to get to a new club if he's decided he'll not win what he wants at Arsenal.
The Suarez analogy is flawed to the point of irrelevance, Luis Suarez's whole career was built around trying to get to Barcelona because it's where his wife lived and where her whole family was from. He was told that he'd be sold if Barcelona wanted him, that's why he stayed.