Indeed, the largest base for conservatism today will be, quite literally, dying off in the near future. The Republican party is the old white party, which is not a very good survival strategy, as white people will cease to be a majority in about three decades, and todays elderly will be dead. This seems to be a much more significant problem than the Democratic party going too far to the left, which is actually a wise strategy for the future, if we are to believe the data suggesting the millennial generation is the most liberal yet. In fact, a few years ago, a Pew poll suggested that millennials (18-29) view socialism more favorably than capitalism, which is quite astonishing for the United States.
Source: salon.com