If it were easy to just up and quit identifying with the Democratic Party, a lot more American voters would have done so by now—Progressives in particular. Codependency with an abusive political partner is a painfully difficult state of existence. The ever-present fallacy of false alternatives is downright cruel: "What, you're gonna leave me? Where are you gonna go—to the Republicans?"
Stop it, Democratic establishment. Just fucking stop it. Of the millions of us who no longer identify as Democrats, some of us have gone to the Republicans. Others have joined smaller parties like the Greens. The huge majority have given up on partisan politics entirely, including the largest cohort of all: those who don't vote, even in presidential elections.