While I'm inclined to agree with you; Real or imagined, there is something to his point. I think it is at least worth addressing in order to properly respond. Take the following:
The future is in limbo - it is obviously in limbo everywhere. Saban (or insert any coach) could die tomorrow from, well, anything. Yet we assign the larger risk to Kill through our own ignorance of his condition. The point is people wrongly always project current conditions into the next four years, especially immature children, instructed by men who's well paying jobs are aided by strategically misinforming said young minds about rival coaches.
Sure is a lot easier to construct a false narrative for Missouri or Alabama than it is for MN right now.
Heck, think of how cyclical teams are; Take Alabama; team gets good, wins championships, recruits flow. However, recruits came after sustained success, not before. Given the last team to Three Peat was 80 years ago, These current recruits are unlikely going to be part of the AL trend. Problem is, try to tell the J.C .Hassenhauers of the world that. Look for the rising star not the current star.
There is some risk with Kill's illness. However, it can be a good thing too. It all depends how the issue is framed by the coaches and university.
The U seams to be doing well with it. I think Souhan, as dumb as he was, was a blessing. His ignorant diatribe, unleashed a flow of positive emotion and press. We couldn't buy that kind of emotionally charged advertising. MN was being regulary mentioned in ESPN and national press. Given emotions are the best keys to creating long term memories having an outpouring of such attached to the school's name is huge. Kids won't care about the context, they'll positively remember Minnesota. Especially given were being mentioned tangentially elsewhere in National champion talk (Louisville for bball and 3peat stuff in Football).
All in all, I think your point beats your arch nemesis's, but his does merit consideration, because that's how kids are liable to think.