I had a meeting in downtown DC today and spoke with a couple of men who attended the DC Defenders Game at Audi Stadium, which was recently built, brand new for DC United in the new “ballpark” area of DC. The stadium was basically at capacity (only fits 18k) and was a much better football experience than FedEx, per the guy who attended. He loved it- and even thought the quality of football was “fantastic.”
Based on watching on TV, I am not sure that other cities replicated that experience. That said, I think the Redskins have some real competition for fans in DC based off of my friends analysis.