Your article is a shot fired from the side of pragmatism in the Left's civil war between pragmatists and ideologists. As can be seen by a few of the other comments, the ideologists demand ideological purity, and if they can't get exactly what they want, they'll just take their ball and go home...whereas the pragmatists realize that they can't have everything just the way they want it, that democracy doesn't work that way.
The idealists rail against the idea of having to settle for half a loaf instead of the whole loaf...but a half a loaf also enables one to live for another day, to continue the fight to change and build a better America. But if one refuses that half loaf...one starves. What Bernie stood for will starve for financial and social support if it's unwilling to work with the much-more-numerous moderate Dems.
After all, small-d democracy is designed to work by compromise, not by dying on ideological hills.