It is a decentralization of information that's happening today. The mainstream media becomes less relevant year after year. It is a decentralization of education as massively online open courses (MOOCs) replace higher education. As khan academy makes a classroom redundant, parents must question the validity of sending their children off to public school. As homeschooling and unschooling grow in popularity, the eager tax slaves of the state diminish in number. Bitcoin is the decentralization of currency. Out and away from the central bankers.
The next stage is 3D printing. The state recognizes the threat of 3D but is limited in its scope. Just as it couldn't predict the destruction of its state run indoctrination farms known as schools, it can't predict the effects of 3D printing. It goes beyond printing guns. In fact, if it were only useable to print guns than it would have far less scope. Instead it is the destruction of the industrialized world.
Taoist thought goes like this: all that rises must fall, all that expands must contract. Cycles. Up and down like the tides of the sea.
Why do I believe we'll be leaving cities? I know demographics do not favor this idea. Most cities in the US grow every year. They're not shrinking. One of the reasons the city will shrink in the future is because most people living in a city aren't happy. Cities mimic prisons and the people often exhibit behavior similar to animals in captivity.