First off it isnt "you guys", I voted for Warren and I voted for Sanders in 2016. I am not who you have to convince. But this reply is typical of the hardcore Berners in that is their way or the highway. The public option, would be better than what we have now, so there is absolutely no reason to burn down the entire house because you didn't get to add an addition you wanted.
IN saying that, I could easily argue the Bernie people aren't truly worried about progress either, since it is obvious a lot of them can't even bothered to vote or comprimise on anything. Pretending to be revolutionary on twitter is meaningless in the real world and this supposed large base Bernie had built doesnt appear to have come to fruition.
And if you want to tell older African American's in South Carolina, Tennessee, Alabama, etc, many who lived through segregation, Jim Crow, fought for civil rights, etc that they don't deserve medicare because they disagree with a bunch of young white people, then you might want to rethink the strategy.