I'm sorry, but I believe it is true, especially for long time ticket holders.
No one who has spent a lot of money and years building up senority/priority points will stop buying their season tickets and lose all of that because of a coach coming back for another year.
If he comes back it will be for a year, a year in which he either does it or not.
No one will not renew over one year, and if they don't they are foolish, giving up all they have earned to start at zero all over again.
I did it is basketball, and I'll do it for football as well if I think the school doesn't give a crap about winning. It's not about waiting another year, it is about a clear signal that they are going to do the bare minimum for the program, in which case there is no real reason to believe it will get better when they hire the next coach who is barely qualified.
The expectation being that I won't need to 'start over gain at zero' because I won't be starting over again as the program will remain in the toilet. I certainly wasn't proven wrong in basketball.