Conti manage very well in getting off our pathetic 2011m runway even with a 6kt tail wind in a 752, what would the problem be, with regard to aircraft performance if City went up to 2300m?
Mind you, the idea that Conti would up sticks and move to the harbour is a bit far fetched. For Conti pax, the bus journey is negligible, lets face it, Liberty to downtown Manhatten takes between 30 mins and 1hr 15 depending on time of day so I can't see Conti being that concerned about onward journey times for it's pax.