I guarantee that had the Democrats turned in a respectable performance in 2014 like they did in 1998, this would be about the Republicans.
The media has a very bad habit of reading way too much into single elections ie: "The Obama coalition has made it impossible for republicans to win", "The republicans are now dominant because muh turnout", "Democrats are the majority party because they have won the last 4 of 6 presidential elections", or "Republicans are the majority party because they have held the house 18 of the last 22 years"