You assume it's a necessity thing instead of a desire+wealth thing. Yet the history of the wealthy and powerful "escaping" to large estates goes back centuries (millenia!).
Additionally, the housing affordability crisis is also happening in European cities with 4+ story buildings everywhere and shops and restaurants on every corner.
If you misunderstand what exactly the problem is and what exactly is being desired and what is being purchased then any sort of "build it and they come" attempts to provide alternatives will be limited by the misconceptions, and any sort of enforce-through-policy change will by stymied by lack of popular support.
