There is some of what you are describing going on but the ideal scenario we could find ourselves in would be people finally snapping out of the old way of "arguments reflecting a very limited set of common news venues", as you said, to actually thinking for themselves. 
The menu of information available through the internet is a vast survey of available information. 
The slant you present in your comment seems to suggest that the old main stream news venues provided a service by more or less presenting the moderate point of view. 
However, that was never always the case and for them to "control the narrative" as you say is always terribly dangerous. 
I saw the MSM present he breakdown of peace talks in Israel in 2000 as, "The Jews" killing children who only want to be free" It was "Jew Slander" nothing more and nothing less. Since that time I have only felt complete hatred  towards the MSM. But even  long before then I was able to pick up on the lies and spin that do us all no good.