While it's laudable that people can afford detached housing in the extended metro area, I think calling the special wards "central Tokyo" is a bit of a stretch.

While it's laudable that people can afford detached housing in the extended metro area, I think calling the special wards "central Tokyo" is a bit of a stretch. (Especially given that they reach the border of Tokyo prefecture to the north and east.) But in any case, as far as I can see your vision doesn't even conflict with the urbanists. They want the dense urban cores and excellent public transport that allows Tokyo's suburbs to exist. Where they are hostile to suburbs, it's where they are enforced by zoning and are getting in the way of density in places where it makes sense and making single family dwellings more expensive in the process. Indeed many would argue that the success of cities in Japan can be largely attributed to their laxer zoning laws, which is one of the primary things urbanists argue for.