Bernie has become irrelevant. This is what happens in politics when you overplay a weak hand. The "vanish from media" bit was written to underline that he has become irrelevant. He failed to win the candidacy, then he played hardball to achieve his objectives anyway. He won some concessions but the Democratic Party, including those that supported Bernie, myself included, see Trump as the real threat and is not going to let Bernie become a distraction any longer.
This is where you tell me that we have to fight for what we believe in, even if it means a fascist party takes over. The problem is, you are wrong. Fascists cannot ever be allowed in power because they don't ever give it up once they have it. And if you think Hillary is a Fascist, think again.