It is only partly Trump.
The main reason the media no longer controls the debate is the new media, like Twitter, is an alternate way to get information out.
Trump was able to take advantage of the new media to break the stranglehold on information flow that the establishment media had for decades. It has been building for years.
It has not happened sooner, because conventional politicians could not figure out how to use the new media to full advantage. The closest was Ted Cruz. He used new media to get elected to the Senate.
The BSM is only really effective when the libtards are in power and it can function as the propaganda arm of the libtard state. The State can then “make things happen” that support the BSM.
When libtards are not in power they have to go back to their day job at the BSM. Actually committing journalism. Doing research, tracking down interviews, piecing together stories. Things are so much easier when Podesta and crew just send you talking points to report.
I suspect this is why Trump has their knickers in a bunch. Party’s over. Back to work.