I absolutely love the size and atmosphere of Gampel and despite the building being a circle, the seating bowl is rectangular and just fine IMO.
The big thing they need to do is put on a big addition to house concessions, beer garden, bathrooms, gathering space and other amenities. I was recently at Crisler Arena in Michigan and they have an old building with a concrete perimeter, no windows etc. What they did was added a whole structure right off the side of it with atrium spaces, more concessions. etc. Before and after pics:
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The big thing with Gampel would be where to get the land to build it. Could they take that diagonal connector building between Gampel and the fieldhouse down and build something there that extends all the way out to Hillside and the Jonathan the Husky Statue?