I'm less concerned with central business districts having the same architectural form. That's clearly function following form to some extent; people who work in those places want space and light, and as much of it as possible in a small area. I'm more concerned about the Brooklyn-ification of everything. Interior aesthetics, menu items, playlists, etc., are converging in places like Saratoga Springs and Omaha in a way that really dulls the sense of place you used to get traveling America.