Sloan, Hornacek, possibly Brian Shaw.
A week ago I was 95% sure Ty would be back as head coach next season. Now I'm around 60% confident. There will be alot of egg on the front office's face if the Jazz don't come close to making the playoffs (a distinct possibility w/their schedule) - especially after (atleast up until a few weeks ago) they've been going out of their way to defend and support Corbin's decision-making and stressing how important it was to the franchise to win games and make the playoffs.
It was February 22, 2012 that I realized that Corbin wasn't as much of an inexperienced NBA head coach as he was simply a poor NBA head coach, and in the next 13 months he's done nothing to change my mind. There's virtually no evidence that he will do anything that will change his course over the next 13 months - so the Jazz need to stop wasting time (and time is very precious when you've got young talent because obviously they won't be young forever and the majority of players improve the most when they're young).
If by some reason they aren't already, sooner or later Utah's non-free agents are going to get fed up with all this and then Utah will be in two consecutive rebuilding projects with no ice cream in between.