The metro areas are growing for sure and look to continue as rural America empties out. I'm sure there will be some sort of argument about places in the west or south that are growing around employment nodes outside what we'd generally consider a traditional core (like NYC, Boston, or Chicago has) really being proof that suburbia is superior but it's really just a consequence of those places being built out differently (more auto dependent largely).
Related to this, I remember reading that the fewer than 500 counties that Hillary Clinton won were responsible for nearly 2/3rds of US GDP. Basically it was a story of the economically productive areas vs. the non-productive areas.