But here lies the problem: the new Manhatten would be a deserted place. No people, no open shops, no work, no open restaurants.

Sure, you can move there toghether with a few 100 other people, but it won't be Manhatten as you know it.

The value is in the social network.

You can go and copy Facebook tech, it's not that crazy hard. Will you be Facebook? No because none of your friends are on FacebookGold.