For stadiums to be built in the next 3-5 years, the changes with autonomous vehicles might be considered. The need for significant parking lots/spaces could become a thing of the past. Younger people may choose to not own a car that remains unused 90% of the time. No car payments, no insurance, etc. Here is an article discussing this from a DC perspective but there are others similar to this. Just something else that might be deliberated when building a stadium.
https://ggwash.org/view/40474/self-driving-cars-could-change-a-lot-about-tailgating