Let's face it. The chairs that they're allowing you to rent aren't good. They're the same ones that they've had for years before, and the 1/4" steel "backing" that these chairs have is inefficient for 90% of people who have purchased them.
You'll still have people who lean too far back and create little (if any) legroom for the people in back of them.
You'll still have people who are too fat, and require more "elbow room" than their ticket was originally designed for.
People who think that the stadium chair banning is going to solve their leg and elbow room problems are in for a TOUGH awakening.