The Republican and Democratic parties both have major problems.
The Republican Party's problems (lack of appeal to young and minority voters) has been rehashed so many times I don't want to go over it again. The Democratic Party's problem is that young and minority voters don't turn out. In presidential elections, the Democrats clear the board. In midterms they get demolished as turnout plummets.
This has led to a vicious boom-bust cycle that has the media hysterically claiming that the other party is doomed every two years.
The question is: which party can fix their problem first? Will the Democrats develop the organization to turn out their voters in 2018? Or will Republicans find a candidate, platform, and message that can win over a sizable number of Latinos in 2016?
What Mehmentum said. There's nothing more to add really.