The latest Gallup poll results show that 40% of American voters no longer belong to or identify with either the democratic or Republican parties. I've been telling this to people for the last 10 years now. Elections are won by motivating the particulars parties base and figuring out what is the most immediate concern of Independent voters.
The old guard on both sides of the political aisle are ever more rapidly losing their relevancy. It's going to make for an inreasingly bumpy ride but change is always inevitable and rarely comfortable.