Yes, it happens.
There were a significant number of fans who pulled their support and refused to renew their season tickets after Jim Molinari was fired. I know several personally. So it happens, and I can only say that people are free to do what they want in those situations. Some of them were decades-long supporters, who have never returned to games, others have softened their stance and returned.
Despite the fact that I am a personal friend of Coach Mo's, and still remain close to him, I also remained loyal to Bradley, as the great majority of fans did. But we probably will see some fans diverge if and when such changes come to the men's basketball program.
Don't think some didn't renew because Coach Molinari was let go, but because Coach Les was hired over "their" choice.