RGR's celebration is premature.
As Mark Twain famously said, "reports of my death are greatly exaggerated".
If the Socialists in America (Democrat Party) are correct, and their Socialist policies work for the first time in recorded history (they will not), they will enjoy sustained and strong support.
If history, economic reality, human nature stay true to the form evident in any careful reading of the past few thousand years of human history, the inevitable utter failure of the Socialist program will bring the masses to a very harsh realization.
Socialist policies have never worked to the ultimate benefit of the masses, and never will.
Moving left is no solution for Republicans.
Action at the State level is the strategy.