This is merely a tracking entry meant to help me start collecting information, and eventually any related prophecies to this as I've been hearing more and more chatter about this, and remember (but unfortunately don't have) prophecies that talked about this some time back. Anyhow, the general gist of the prophecy is this. At some point in time in the future (we're kinda seeing that now) we will see liberal cities, due to their horrible fiscal and social policies, begin to collapse, go bankrupt, and lose huge amounts of citizens in droves, leaving only the poorest behind in the cities as they collapse. Inversely, cities that are conservative in their social and financial policies will see a sharp rise in both prosperity and citizenship. Prosperity in the conservative cities will be on a scale never before seen.
Now, that being said, I don't know if the liberal cities will be completely abandoned (Honestly, I don't think they will be, but I can't be sure), but they will certainly be a shadow of their former selves. Detroit is a great example of this where it has shrank from its high of nearly 2 Million residents in 1950 to just barely 700k today. And that number is falling still. New York recently has begun to see that same thing happen, along with Seattle and some others.
(*Do you have a better description, or did you find an error? Please let me know.