Could you imagine the Burrito Buggy and O'Hooley's at the stadium for game days what the local reception for Bobcat football would be? It could be so much better down at the stadium without having to be that much bigger.
There is absolutely no reason they can't do this. They do it around here; besides the normal stadium fare, they have places (and even roaming vendors) who sell local specialty foods such as "Runza" and "Valentino's Pizza". Now, they do slash their menu options, of course, so there is just one type of "Runza", and just one kind of pizza, hamburger, if I remember correctly.
Just make the option to have a spot at the stadium available to Burrito Buggy and O'Hooley's, and charge them a fair price, and they should be able to have a win-win situation.