I haven't been there in a few months but that's not always an open lot of dirt. I've seen it used for intramurals, random student gatherings and parking for football games. My guess is the Google Maps image was taken after a full football season of cars and various other vehicles parking on it. I just think the whole front of the stadium and green space surrounding it looks great, and a random building plopped down would look silly. I realize you live in Orlando and there is basically no natural space left, but open areas not developed is appealing to many people.