Having attended a UC school where alcohol was not a factor at any athletic venue, and having a son attend the same institution without alcohol at games, I am a strong proponent that alcohol NOT be made available at state supported facilities. I believe it DOES send the wrong message to the student-athletes, but my opinion on underage alcohol consumption has been stated clearly (and put down clearly) in other fora so this opinion shouldn't surprise anybody.
People, including my own husband, have tried to convince me that beer sales, or the lack thereof, can definitely impact the fan turn-out at the games However, it is my contention that the SUCCESS of the team is what draws fans, not the beer. In Riverside, years ago, there was a minor league team that played at the same sports complex which is now jointly handled by the city and the school. The team franchise left the sports complex and actually moved to Adelanto (high desert) because the city would not allow beer sales at the complex. I have heard different reasoning as to why UCR did not have beer sales ... I have heard it was because of the city and I have heard that it is because of UCR. I don't know which is truth, but when I attended UCR, I was told that there was some law on the books that forbad alcohol sales (including closed containers at liquor stores) within a mile of a UC campas. So I think no alcohol sales at UC's have history tho I don't know what the current situation is with the other UC's. I believe Cal has a wine garden of some sort at their baseball games ... perhaps URKMB can clarify that ... and I know that UCSB does not have beer (heck, they are lucky if they have ANY beverages with their almost non-existent "snack bar").
Anyway ... I think it is a good ruling, but then, I also believe that I am in the vast minority.