Eh, I don't totally agree. Before Rack got there and they started recruiting, they were competitive, definitely not elite. Even when I was there, we were winning 5-6 games a year just about, 1 & out in the playoffs was our ceiling.
As far as demographics, they've definitely changed, a lot in fact. When I was there, it was at least 75% white. I just looked up the most recent numbers, and it's closer to 40% white now, & 48% hispanic. The black population hasn't increased nearly as much, so you're right that most are there for football. I subbed there once a few years ago and could just tell by looking at students walking around that it was different.