Sorry to seem to talk down to you, but WiFi will not be improved by cell towers. WiFi is a direct internet connection for data only, while the cellular towers (Verizon, US Cellular) will be for phone, text, and data (3G, 4G, etc.). The towers may improve internet reception, but phone users will still be using their data connection, and not WiFi.
If the stadium were to install WiFi, it would be quite a big deal. However, that's a lot of traffic to handle, and I'm guessing it would take a fair amount of new infrastructure (cabling, access points, etc.) to make it work sufficiently to handle the demand. I know some stadiums have WiFi, so I'm sure the U of I Athletic Dept could make it happen at some point.