"The Next Slum?" if anything underestimates how bad things are going to get for the suburbs.
There's not much more ability at the margins for people to absorb higher fuel costs, and yet fuel costs in the long-term are going nowhere but up.
In the meantime, as the article notes, modern exurbs cannot be reconfigured into anything useful - but even more important, it's impossible to serve them with reasonably priced mass transit due to their broken roadway design.