I don't even understand what the "Fairness Doctrine" would mean today.
In the 1960s and 70s and early 80s, it essentially gave a right of reply on broadcast media. It meant nothing on cable, it mean nothing in the world of books, it didn't mean much for the press (they had to be careful about libel anyway).
If it is raining outside, and there's someone who says "it's raining outside" and someone says "it's not raining outside", how is anyone's life improved by the idea that they should both be given air time?
The job of a journalist/reporter/something is to figure out what is going on, and tell that story (maybe by using quotes from other people).
The problem is that when the story is more complex than "is it raining?" there isn't a single answer, and there isn't a single way to tell the story. In making choices about what to tell and in what order, one becomes "partisan".
I prefer the solution in the UK, where nobody seriously thinks of any newspaper as "neutral", and yet despite their relatively clear biases, they all manage to tell roughly the same stories, albeit with different emphasis.
Contrast that to the US, where mainstream and rightwing-media-claiming-to-be-mainstream don't even tell the same stories, and when they do, they sometimes make essentially opposite claims about them.
There will always be room for "fringe" or "eclectic" takes. The far-left has had to deal with that essentially forever, and the far-right used to. What's really changed IMO is that in the last few decades, approaches to story-telling (which is all journalism really is) that used to be confined to the fringe far-right outlets ended up appearing on mass-audience outlets.