At Carolina, we have reduced capacity by almost 20%.
22" seat back chairs replaced aluminum benches. Not good if you want to share a stadium blanket with someone on a cold day, but having more space and more leg room is a plus. It's also eliminated people down the row squeezing in a few friends and inconveniencing everybody else.
Bathrooms and concessions are less crowded and the parking problems have been eased.
Customer service (comfort and convenience) replaced a "pack 'em" in mentality and it seems to be working.