Unlike Gruden, Gundy and Brohm (and etc...), I think this deal gets done. The first three had job security and pretty lucrative contracts in place (or the ability to parlay a UT deal into job security and more money for Brohm). OK State has competitive facilities and Purdue is making a massive upgrade. And all three also have other good options if they sour on their current employers.
Doeren, on the other hand, is on shaky ground for the last two years. I'm pretty sure NC State's admin would be more than happy to help him pack. It is also a place where football is never going to be a priority. It has been awhile since I've been there but NC State's football facilities were closer to Duke or Wake Forest's than UNC or Clemson's.
I also can't think of a viable alternative to his current job. At one time, I would have thought he might be the leading candidate for Wisconsin if Chryst went to the NFL. I think that ship has sailed though.