There's a lot of speculation about boogeymen but I don't see it realistically happening. The second bidder stuff is really not feasible because the city wants this. If you come along and say I'll bid $100m and I'm just going to build some houses instead, screw the sports team, well good luck getting the city to buy off on your proposal. Yes the city probably won't just accept the tax district that the Coyotes propose but these are simple negotiations. The Coyotes and City can negotiate on things like admissions and parking taxes and get much of the way there. The financing for the rest of the project is pretty much when its available and the development can underwrite it, they will build it. High-end residential doesn't need to be finished to make this project work, just build the damn arena already.
And as much as other cities are saying they are ready to take the team over, no one's project makes as much financial sense as this one does that I have seen. Maybe the Atlanta one is close but I don't know if they really need an arena and team to make that one feasible. That location can support a development like that one with a smaller arena and it still works.
I have been involved in the analysis in a few of these before and they all have a "feeling" once everyone is seeing eye to eye. I think this one has a feeling. As much as some apathy and finger is pointing about who is to blame, no one really wants them to leave the Valley.