I guess I see your point. They'd have more space too for stuff. That might be interesting. Weight and thinness is really where it seems to be. That could be even more thin lol.
I can't really see the point of that. If someone wants a large-screen portable, they should buy a MBP. The MBA is designed to be small, yet full-sized at the same time. A 13" screen is plenty enough, especially for an ultra-portable.