Where did I suggest expanding the football stadium? That road is so critical to getting students on campus that they close it down during the day. There are plenty other connections to the campus (Folsom, Colorado, Regent, 18th, Euclid, University, Stadium Drive).
But fine, if your bus routes are sacred, then get rid of Balch and wrap Stadium drive around Folsom connecting it to Colorado. Close Colorado between Folsom and the new Stadium Drive connection. Create a plaza on that closed section of Colorado then extend it down the current walkway linking Folsom Field to Farrand Field.