It would also be great if they made an effort to primary candidates one can vote FOR instead of relying on WBNMW and delaying the inevitable (which, as I said, will likely lead to an even worse Republican presidency.

Centrists ejected David Hogg from the party for trying to do that. The Democratic Party didn't spend a decade sabotaging the primary process, to the point where they now just expect to appoint a centrist and order everyone to vote for them, just to let the left stroll in with candidates people want to vote for.

Maybe they need to be shown that something better is possible.

They know something better is possible. They oppose anything better.