What this tells me is that the results of the mid-terms were more a function of GOP having localized control over those regional races rather than some significant shift towards the GOP. They are still getting trounced nationally. And with the changes in demographics, its just going to become more stark.
I submit that over time, as Dem voters traditionally gravitate to population centers whereas the GOP hangs on in the more rural Southern states, plus the plains states, you will hear more and more about decentralization, secession, anything that emphasizes local or state control and what is left of the GOP power base, concentrated in those states.