Even after reading the article, I still struggle a bit to understand what they mean by “go the way of newspapers”.

In my mind, traditional cable or antenna television has already gone the way of newspapers - still around and used by many people, but largely a memory supplanted by online stuff.

They talk all about how ad spendng may go down, and this is Yahoo Finance, so I guess they mean that TV companies/studios/whatever will not be a very profitable investment option and many may close?