From my perspective, I’d think that Bernie Sanders’ agenda might just be surviving old age through the completion of the election.
You make me think of a couple of things I’ve seen recently. Someone posted here an article showing how old ones like Hillary Clinton, John Kerry, Dianne Feinstein, Nancy Pelosi, and other big name Dems will be on Inauguration Day 2017 (definitely not spring chickens for sure, all close to or well into their 70s and even 80s for some).
Also, there is an article that just came out showing names like Danny DeVito, Susan Sarandon, Bonnie Raitt, David Crosby, Neil Young and others endorsing Sanders. You could do the same sort of thing as with the above in showing how old these ones like Crosby and Sarandon will be in January 2017. This really is a questionable optic for liberal Dems.