You may even see the South becoming solidly Democratic at the state level again because of this. For example, the Democrats got half of Mississippi's congressional districts after the 2008 elections... And we know what happened after 2010.
The Texas legislature was just barely a GOP majority until 2010 in OTL too.
TX Senate in 2009 was 19R 12 D
TX House in 2008 was 76R 74D
TX Senate in 2011 was 19R 12D
TX House in 2011 was 101R 49D