I am no expert, but at the moment, most people would agree, there is not enough demand for this, but by the time all the steps and hurdles needed for such a plan to be built are cleared, the economics very well could justify such a project. I think if a plan this big is going to happen, it needs to already be in the works long before the obvious demand appears, or else we just end up with a hole in the ground or an unfinished 20 story parking garage.