All for it. Its just plain not fair to average size persons to have less than their full seat.
That said, I think the airlines should provide seats of larger size in coach. That way larger people could be accomodated in one the larger seats OR pay for 2 seats. If there were no "people of size" on the flight (fat chance) then a few lucky coach passengers will get a little extra room.
BTW isn't it odd that as Americans get larger and larger, airline seats get smaller and smaller?
If we go the route of a "Fat Section" on an airplane, I want a "Cryin' Baby" and "Typhoid Mary" section as well. I am fed up with people coughing and hacking on me on these flight (didn't these people learn to cover their mouths). I got a doozy of a cold a couple of months back after sitting next to one of these carriers.
In all fairness (and to stop being flamed), most of the babies that fly are well behaved and their parents know how to handle them. It is that instance where a kid cries the whole flight while Momma or Poppa have their headphones on watching the movie that gets me.