The world's population has nearly doubled since 1975 and Tampa's population has nearly tripled, so at least there are more potential fans out there.
Seriously, though, despite cultural changes and phone addiction I think college football will only continue to grow its fan base in the coming decades. I've got no scientific evidence for that, but it seems too big to fail at this point. Just hoping USF can benefit one day soon. The stadium may or may not help in that regard, but I'll be thrilled to be there watching on campus for as long as I'm able to get up and move.