Big issue is that right now, if the GoP wins, they are going to do everything in their power to make any election always go their way
Really the proper solution is guillotines, but that's a bit hard in this day and age, leaving, "Democrats until the GoP is no longer a fascist dictatorial danger" as the only realistic solution
Which the Dems know and is why they won't move left - Because they KNOW that, for now, the option is "A beating or getting your limbs gnawed off by a rat"