I don't see how the FAA would ever allow that here- how do you make it nearly as safe as regular seats? As to if the Chinese government would allow it, I have almost no doubts they will if Airbus were to even just rig the airplanes with hand holds like a subway train over painted standing places. I would think the biggest thing that will stop this is max gross weight or max takeoff weight for whatever the conditions are. Adding 40 percent more pax and their baggage has to weigh quite a bit more than the seats they would be removing. Maybe they'll go for a new sort of 2 class configuration with some seats up front and room for enough standing that can be actually get off the ground without being over max takeoff weight. Freaking scary.