The guy who invented this is not a liberal, and he makes some valid points about declining tax base.
However, he leaves out the factor that as suburbs age, inner city scum move in and bring their sick culture with them.
The buildings don’t change. The evil people destroy the neighborhood and the property values drop.
And people flee rather than fight back.
Eventually, we are going to run out of places to flee to.
And in many cases, like Flint MI, the residents not only don’t contribute any tax revenue, they don’t even pay for basic services, like water.