Honestly, I think that the residual Bernie Sanders campaign is less about trying to be president at this point, and more about proving that there's a pretty significant chunk of the US Electorate who would support Democratic Socialist candidates and policies. It also demonstrates that a candidate pushing for those policies is able to garner the support of a large number of disaffected voters who otherwise don't get involved in the process, despite the fact that "Socialism" is still a dirty word in much of the US. It's more about demonstration of a principal, and a statement by his supporters, rather than a legitimate campaign at this point.
I don't think that's a bad thing, either... far from it. Hoping that the relative success of the Sanders campaign, and the fallout of this latest chapter in the hijacking of the GOP by backwards-looking bigots and fundamentalists, will both do something to shake up the status quo of the present Two Party System. Sociologically speaking, we're going through a lot of the End-Of-Dynasty type death throes demonstrated by regime changes in China and Rome... tensions keep getting higher, faith in the government is declining every year, social unrest continues to simmer, and our media keeps painting dreams of revolutions and society-collapsing apocalypses. Forgive the grandiosity here, but I'm hoping this means we have a shot at steering toward major systemic reforms, rather than letting it implode under it's own incompetence, war, rebellion, and the general dissatisfaction of the masses.