A new brand of airline seats called SkyRider, created by Italian company Aviointeriors, are already causing controversy, even though they have yet to be placed in any airplanes. The new seats are basically extremely upright saddles, providing 7" less legroom than most economy seats do now.
The seats are being introduced as an option for low-cost airlines as a way to fit more people in planes. They hardly seem to fit people of normal height and weight. When a company representative was asked about how these seats would accommodate overweight passengers, his response was "try to lose some weight."
It seems as though these types of seats won't work. You be the judge.