Exactly, the only question anybody needs to be asking them is who's interests do you actually represent? Because it's become increasingly obvious that donors of certain Dems have basically hired them to fumble the ball and enable Republicans stay in power.
I think American Oligarchs realized decades ago that creating the conditions that lead to voter apathy and provide credibility to "both sides" arguments, would probably be a cheaper and more effective strategy than convincing a majority of people to actually vote against their own interests.
Not to mention this threat to leave the party bullshit is basically the same as the threat to leave California and NYC bc of wealth tax. Fucking go then and don't let the door hit you on the way out, because you're probably responsible for ~95% of the problem. All you've done is exploit people and help weaken democracy.
Anybody who believes it makes a lick of fucking sense to keep pretending the U.S. is the greatest country in the world and social safety nets are unnecessary, (while most Americans are now struggling to afford groceries, let alone healthcare and education), has already switched teams. They might as well put on their "corporations R people 2!" jersey and own who they've been representing this whole time.