Between the shifting age demographics (old GOP keep dying, young liberal voters coming of age), shifting race demographics (rising population of people of color), many young conservatives being fairly liberal (more supportive of gay rights, climate change, criminal justice reform, etc), and shifting religious demographics (atheism on the rise, religious minorities arguably becoming more visible / forming a voting bloc)....
Add onto that the fact that we have a fully Republican federal government—meaning that they'll have no choice but to take the full burden of the blame when they start passing legislation that hurts the very people who voted for them, and, well...