I wonder about that too. Oligarchy gets serious? Sanders has come so close and no matter what they do, he keeps getting closer. That tells oligarchy that Sanders would win in a landslide if they hadn't cheated as much as they have and they won't risk that happening again. The people choosing whom they want is an annoyance and a threat to oligarchy.
Trump's proto-fascism is a sign as is Hillary's open corruption and deceit. It took too much to defeat the will of the people this time. It pulled back the curtain too far on corruption and lies this time to be able to hold back the will of the people. The oligarchy noticed that. If they can get away with it this one more time, they will make sure that a candidate like Sanders won't happen again.
The thing was that they never expected him to get so far. They had forgotten that he has been an honest man in politics and that took them by surprise. He had a long record of being trustworthy and people liked that about him and what he wanted to do. They believed him.
Too bad Sanders hadn't run instead of Obama. Obama made the word change meaningless. Hillary is doing the same promises promises con game on the voters. Obama was black and she is a woman... Change! Except the status quo's version of change doesn't actually change anything except race and gender. Everything else stays the same.
Wall St Hillary or Wall builder Trump... Do you really see all that much difference? Trump is worse than Hillary which makes her look better than she really is. She promises not to build a wall (maybe just a fence) lol.
Sanders really would change things and that made the oligarchy go all out to stop that kind of thing from happening.