I think you are on to something with this. The Ralph is basically a hole in the ground with two upper decks sticking up. The wind whipping across ECC and into the stadium is really the worst part of the experience, especially in December.
Picture a stadium like Seattle's nestled near downtown (old first ward?) except maybe with slightly larger canopies that extend toward the field (more coverage). A large portion of the crowd would be protected from the elements, while the braver fans can sit in the endzones and be completely exposed. Ironically, people that pay for premium seats in the first few rows close to the field would be exposed, while the cheaper seats are covered. Century Link field sits 67,000 and cost $564M in 2015 dollars. It's something to consider.