As the economy improves, the WSJ has an article documenting slowing growth of urban centers, and faster growth in the suburbs.
This reverses the trend in the great recession, where urban areas, which have denser and lower-cost housing, grew faster.
On its face, it seems as if surburban living is something that higher income people want. However, the sluggish growth in the economy makes it unlikely that we see anything like the migrations that occurred during the 1950's:
Anything resembling the post-World War II trend of Americans streaming to the suburbs appears unlikely given the difficulties many debt-strapped young Americans face in buying a home. Still, the Census numbers show a cooling off in the growth rate of urban dwellers..