The enemy is lack of connectivity?

Opportunities left and the middle class left with them.  Areas didn’t start as entirely poor, it’s just everyone else left because they could.  Along with their need for services, restaurants, and other small businesses that provide the first step ladder of opportunity for the poor.

And we urbanists are getting far better at understanding the root infrastructure causes of dislocation and isolation and thus can predict what areas will see disinvestment and what areas will be gentrified.  It’s all in the streets.  Connectivity matters.  I sense that most urbanists and planners intuitively get that connectivity matters but don’t really get the deeper relationship as to why.