Originally Posted by
demoncyclist
The next move would be to move road bikes to the same 135 OLD as mountain bikes, so that they can keep the same spacing as 10 speed, but add another gear. Obviously, short chainstay designs would make the chainline a little more wonky than it is now, but I wouldn't be surprised if they are at least looking at it.
Or go even wider like the 140 mm tandems use. But, as you noted, short chainstays would make the chainline bad and heel clearance with the chainstays could be a problem too. Apparently no one has figured out a practical way to do it.