(i use "republican" because "GOP" annoying me. Dem are older than rep !)
some elements make me think than this numeral victory of the republicans will be a cause of deception for 2016
-number of votes : very behind the 2010 score. Conclusion : there is no wave for republicans but most simply, dem stay home. More : rep lost more vote than democrats (-5,4 M for rep, -4,9 for dem)
-local referendum : even in republicans states, people vote in a majority for traditionnal dem patterns, like minimal wage.
conclusion : except a world war or pandemic, the democrate candidate in 2016 WILL win the white house
You had good points up to the conclusion. Yes, 2014 was not as much of a quantitative wave, but it was a building process on 2010, which is pretty impressive. Even with very low turnout, R's stayed home too, just less of them. How this means the D's will win in 2016, I don't know. You could say they'll do better because of better turnout, but saying they will win in almost all circumstances is pretty delusional.