That's often a point that I've brought up.
Some folks have often had the hypothesis of "well, if we just bash Fox out of existence and point out all the reasons why people were foolish for believing them, they'll take it into consideration and move back toward the middle", but that doesn't tend to be the case.
From viewing patterns on election night (when Fox News started telling them some things they didn't want to hear before panicking and reversing course back to conspiracy land), when people bailed on Fox, they didn't say "well, Gee I guess I'll go watch PBS or NBC", they immediately switched over to Newsmax.
To a lesser degree, we saw a similar pattern on the left side of the fence as well. When the new CNN head announced that he was going to try to move the network more toward a neutral position, CNN lost viewers and MSNBC gained viewers.
Our news media (and the relationship the viewing public has with them) have developed something of an unhealthy relationship, where the primary focus is "do they agree with what I already want to believe?" and if people actually get informed watching it, it's merely a fortunate byproduct.