Not going to be many lining up for the job due to lack of job security. They must assume when Snyder goes, they will be without a gig (unless Snyder hires a HCIW, which he probably won't).
So who is left? Those desperate for a gig (recently fired and needing a transition job, or a young coach hoping it will be a chance to elevate their status - but even for the young ones there is a ton of risk involved if they only get a year to do their things - especially if they fear Snyder is playing the system and will step down in July or August, and force Sean into the spot and creating added chaos in the job that will further undermine their chances for success).