Yeah the issue is the runways at most airports. It's not so much the plane itself. I remember reading something about the 777 or 767 when it was being designed and how LGA
's runways actually needed to be strengthened just for it - and it has bogied wheels. (LGA
's runways are partially on piers.). The 777 was initially intended to operate at LGA
- one of the reasons for the folding wing option - so it wouldn't be as strange as it sounds to say that now.
The issue is the weight per wheel. When you start subtracting wheels, you start adding to the weight on any given wheel, until you reach the breaking point of the runway for that little contact patch where the tire is resting on it. Runways are all designed to withstand X number of lbs. per wheel, and airliners are therefore designed to have the commensurate number of wheels to distribute that weight given the airports the airliner is intended to fly into.
So basically, unless you rebuild all the major airports' runways all around the world, then no, I don't think we'll be seeing a six wheel widebody any time soon.
[Edited 2011-10-21 19:14:37]
I'm tired of being a wanna-be league bowler. I wanna be a league bowler!