The average family making average wages in Tokyo, can afford a brand new detached home inside central Tokyo.
The same is not true in any of the top 50 cities in the US. Even the smaller unpopular cities, even the cities that have slower population growth than Tokyo, or have cheaper land than Tokyo.
You should watch the videos linked above, it explains all of this in simple but detailed language.
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.