That would be our only hope of getting him imo. Unfortunately, i don't see him doing that. It's a world cup year, he might have a strop and a moan but when the window closes he'd knuckle down for the year with the world cup waiting and knowing he can leave in the summer.
You may well be right, however there is one thing for sure Sanchez is absolutely guaranteed to start for Chile in the world cup if fit no matter what is club form attitude etc have been during the year.