Over the last century, one major change was the arrival of television - that made a huge change in the way news is reported as well as in the world of media entertainment. And more recently there has been a further change, with the arrival of the internet. We now have more media outlets than ever before.
The biggest changes by far are technological... By leaps and bounds. What started as teletype machines and news sent by wire or telegram and printed newspapers being printed largely by hand - has become instant news via the internet, first on computers then on digital mobile downloads. Printed news has seen a decline in its relevance - though, being an aspiring writer, I personally cherish printed works ever still. ;)