Most of the midwest is losing population except some of the suburbs around the big cities, or certain growth hubs like Dane WI, Washtenaw MI, or Franklin OH.
If anything the suburbs continuing to trend Democratic will be what causes problems for the Republicans with the rural areas losing people.
Except is there any evidence that the Suburbs are actually trending Democrat? I know that here in Pennsylvania Suburban Pittsburgh is becoming very Republican very quickly and Suburban Philadelphia started to Trend Democrat from 2004 to 2008 but since has stopped.
The growing parts of Pittsburgh, namely Alleghany and Butler counties, are both trending dem from 2012 to 2016. Also most of the growing parts of PA in the east trended Dem as well, except maybe Lehigh county.
Areas that are losing population and then "trend" Republican could just mean the Dem voters are leaving the area, not that Republicans are really adding many new voters.
