I believe stadiums in the future, especially in cold weather climates, will have to cater to a wider variety of fan/customer. what I mean is more domed stadiums so the rain and cold aren't a factor for the actual game experience. You'll still have to drive in it to get to the stadium but once there...
Also, the amenities at the stadium and the way the whole concept is structured needs to change. Easier, faster access to your car or bus. Tiered parking lots attached to the stadium itself so that the fan/customer walks from their vehicle to their seating section as directly as possible. Shopping, restaurants and attractions so that the entire group doesn't necessarily have to be physically at the game for the entire family to have a day "out on the town". Restrooms and vender's booths closer to the seats and more of them to reduce waiting lines. WIFI capability and whatever the future brings in the form of social electronic interaction.
Especially in CT with the unpredictable weather and the big city distractions near by a multi/variable-use sports/entertainment/shopping complex is almost going to be a must. UConn does not have the luxury of a captive audience with a on campus stadium so filling something that's 25 miles away with 25% students is almost impossible.
Big dollars. Huge state and private funding absolutely a must. But with an aging civic center in downtown that was put in the wrong spot as far as accessibility in the first place it's time to plan for the future.
If the fan of the future likes being entertained in a living room type of atmosphere more than a live stadium crowd type then you'll need to construct stadiums to be more living room-like. How you do that will be interesting to see.