First off... a quote of $200 million per year? Beyond the number itself which probably isn't unrealistic for anything in Manhattan. It works out to the bonuses of a few bankers really. But the temporal reference. I suppose it really is realistic to think of this all lasting for years, as in plural. As for the economic impact... maybe the Common Plea will wind up running a daily 'Federal Marshal Special'.
But when you think about it there is enough logic to think it will happen. The connection with Flight 93 no doubt. The logic that probably helped bring the G20 included the topography of Downtown which made it a bit easier to secure than a lot of other places... and then there is the simple argument that the administration could show up with and say we owe them one for the G20 itself. It is all clearly not a zero probability event.
So we could be the center of publicity for much of the world for an extended time... such is the Yin and Yang earned media. My inner prognosticator feels like it could actually happen... but the betting man in me would place odds on that Northern District in Virginia which has some experience dealing with high profile cases just like this.... we will see.