As a 400 F/O I have my reservations about flying the a/c into city.
Ignoring the business side of things and purely thinking about the flying I think it could be a bit iffy. I can see the frequency of go arounds being unacceptably high and also there's a possibility of tail strikes if the a/c should be allowed to get slow on short final coupled with an over zealous flare (maybe due to wind gradient effect).
The a/c Isn't that speed stable on the approach and the power levers are very sensitive in the low range which can cause the pilot grief when making power adjustments close to the ground.
Also the 400 needs to be landed with power on which can lead to a rather prolonged float if you misjudge the flare (not good on a short runway).
From a passenger comfort point of view its not great either, as any 400 pilot will tell you a smooth landing is a bit of a black art mainly due to the design of the gear, (a pogo stick with a wheel on one end is a good enough description). So if you combine short runway, stiff undercarriage, high rate of descent, pilot having a bad day, poor wether, it dosn't look too good to me.
I can see plenty of heavy landing checks being carried out if it goes ahead.