The Suburbs May Scratch That Itch
The underlying premise in this article is correct: Millennials and young families want walkability, visual diversity, and community. Until recently, you could only find that in the city. If suburbs are built with that focus, the migration could change directions.
When people want something but are so used to only being able to find it in one place that they fail to see other available opportunities to satisfy that need, there's a huge opportunity for whoever can communicate most directly and effectively with those people.