Bernie wanted a political revolution. A revolution isn't just a crowd. This isn't Walmart on Black Friday. They don't leave once the commodity is gone. Or at least, they aren't supposed to. So when you have people like Sarah Silverman, who once was all about Bernie, telling Bernie-or-Bust folks to give it up, what does this suggest? It's very difficult to just accept "well you know, you gotta vote for someone, or else bad things will happen."
A true revolution won't just be quelled or helmed by some changeling telling people that she'll do what the revolution holds as a main call to action. 
Hillary's words about holding corporate America and Wall Street accountable ring hollow, especially knowing who her donors are. Even as I watched this, accepting that this is the thing we have to do for now, I see that we have even more of a simmering anger. An anger towards a system that doesn't represent a widening majority of Americans.