Exactly. Think about Mike Hopkins at Syracuse. For ten years, starting in 2007 he was the heir-apparent -- ready to step in when Boeheim retired until he finally gave up and took the HC job at Washington. That was six years ago. Boeheim finally is retiring (and it isn't at all clear that he really wanted to retire) 16 years after Hopkins was identified as the Boeheim successor....because there are only a finite amount of chances you will find to become a Division I head men's basketball coach? The desire for a new challenge, to run your own program, branch out on your own? There is no guarantee his boss moves anywhere, ever, despite his best efforts. So, do you really want to wait around for that if you're motivated to be a head coach? And, if he did, while he might be the favorite, it's not a guarantee. He can ask the assistant coach who recruited him to UVM about that.
I don't even know if he's going to be a serious candidate for the job. It's all just a bunch of early speculation...but eventually guys who have any ambition are going to have to take the opportunities in front of them.
Let's not turn this into a UVM thread though. If Schnieder is a candidate for UNH, he's a candidate. He'll be one of many.
If Schneider has an opportunity to get this job, then he should go for it.