Can't get on board with this mindset. There's no way on earth anyone within the club, including fans, want him to run his contract down and leave on a free, most probably to City.
The sheer thought of selling him for £50m to City or him going on a free to City a year later, and Arsenal fans being ok with that, is incredibly bitter.
If he only wants to go to City, it's a no brainer for you, get rid and reinvest. It's too much of a likely risk that he'd end up here anyway, for nothing, and whatever he costs you in wages between now and then.