I disagree with you here Jon.
I don't think the fans have changed. Well, they have changed a little, but not to the point you are making. I'll get there in a second.
What I think the biggest change is that the marketplace has changed. I will just use the year 1985 as a reference point. In 1985, what were your options for entertainment? Obviously, they were much, much smaller. When you have fewer options for entertainment, making the choice to watch basketball live, even if it is bad basketball, is much easier.
Then we can slim the marketplace down even further. In 1985, when could you watch college basketball? For the vast majority of people, the only time you watched CBB was the CBS games on Saturday. ESPN, for those that even had it, only broadcast tape delayed games. Today, there is literally hours of CBB programming, every single night, on multiple channels.
The competition not just for entertainment, but for college basketball entertainment, is much more severe.
Now, how have the fans changed? The fans now have access to the best teams, the best players, and the best games on demand. While they may tolerate poor play in a vacuum much better, when they have the context of being able to watch the best, that makes it difficult to watch the worst.
Additionally, with the increase in exposure, there is also an increase in input. Thoughts and debate on CBB is not confined to AM radio, writing letters to the newspaper, and talking at the bar. Fan become more informed, and they (feel like) they have more input on the way things go. While the team and coach were (relatively) isolated in 1985, they are now in the proverbial glass house.
So no, I don't think the fans are spoiled. The fans didn't change (much), the landscape has changed.