Single aisle?
Loved the A300/310
Well they could also equip the A330 with a new, small lighter wing/ wingbox and modern engines, kind of A310 NG.
But it would mean a much bigger project to make it light and efficient. More investment, time to market, probably a lower return on investment with the current A330 market being largely filled in by 787s and A350s..
http://i191.photobucket.com/albums/z...0-700Light.jpg