More likely it will increase the divide. Regardless of the surface changes, society will pull back from the problem areas to more strongly defend the more upper crust areas.
Law, order, and the 21st century inside the gated communities, dog eat dog barbarism in the rest of the urban environment.
That's a
really good concept / reality I hadn't even thought of. Practical, and makes good sense.
Expounding on that... I might suppose cities having "Private Police Forces" similar to the "contractors" operating on our behalf in Iraq. Even then paying particular attention to some neighborhoods within each city more so than others. Gated communities are already on the up-rise around here anyway.
One city near here that is well known as "The Grand Strand Ghetto", Atlantic Beach, has already fired their entire police force due to "departmental corruption" and their inability to pay them because that city has gone bankrupt from other corruption, embezzling and usual ghetto town issues. All the while Myrtle Beach and other neighboring cities are
actually doing well this season!!! 
Atlantic Beach is publicly pleading with the neighboring cities to "adopt" them.

So
yeah. What you say is already happening under my nose and I didn't even see it!
http://www.carolinalive.com/news/story.aspx?id=647712#.TkKu3mM4nVk