Some of her supporters undoubtedly are cultists, but no more than with any other candidate. An indulgent example on my part of how easy it is to spin a narrative, if that's what you set out to do ; ) It's a shame so many of our friends aren't as discerning as you in the information they consume.
I do think though that if their positions were reversed, the Warren supporters (and probably Warren herself) would be demanding Sanders withdraw and back her - and they'd probably be right. She was on the verge of having to drop out anyways due to financial pressure (and the departure of several staffers doesn't help, albeit that was due to the racism of her campaign rather than its lack of funds). But her strong debate performance has bought her a bit more time, and a decent showing in Nevada will help too.
I do hope though that she'll do the responsible thing when the time comes. It would be beyond cynical of her to aim solely to be imposed from above at a brokered convention, and in those circumstances, she'd be even more certainly routed by Trump in the general. But given her track record, I'm not optimistic.