I don't think you can go back to any of the 2010-2011 UFL markets with a new league in the next 5-6 years and gain any traction whatsoever. No matter how much early promise the UFL might have had there. No Hartford, no Omaha. Sorry, but Hambrecht, Huyghue et al. have salted the Earth in those cities.
City leaders and sponsors in thos places are going to say "Show Me, Don't Tell Me". New USFL - or whoever tries spring football next - needs to find places that have been passed over by Major League Soccer's current round of expansion and where the civic leaders are clamoring to bring any sort of spring pro sport to town to burnish their own credentials.
Need places that WANT them. Not just pins in the places they like on a map