Completely different situations. Not apples to apples. College hoops is cyclical for all but the big dogs. No program just has a constant linear uptick in performance for perpetuity.
With that said, yes Fran can and should be questioned about the talent on the roster this year. He is responsible for assembling the roster. Frankly, the recruiting in the 13-15 classes was not at a level good enough to win in the B1G. The good players from those classes would be Jok, Baer (a walk-on who is best suited as a role player/6th man), and Moss, who is just starting to contribute. Fleming, Ellingson, Jones, Williams, Wagner, Uhl, Dickerson either left, injured or just not all that great. That is far too many misses to not have a down year once the 4 senior starters left.
The point is that Iowa was a program which appeared in the NCAA tournament 3 times in 14 years prior to Fran making it 3 straight years, almost an entire generation of irrelevance of the Iowa program. Barring breaking the law or rules, Fran's seat is not hot this year or even next year, nor should it be. Iowa would be laughed at for canning a coach in that scenario.
The results for Fran will speak for themselves over the next few years. The current freshman class looks decent/good, if he can follow it up with 2 more such classes he's set up for another 3-4 year run of NCAA tournament appearances. If he can't, then he'll be gone.