Atleast this is what I presume from some data form 2008 and 2009 from the Pew Research Center pewresearch.org/2009/10/30/par…and-cable-news-audiences/ . Furthermore, as of 2018 in July, Ad Week adweek.com/tvnewser/july-2018-…ork-on-basic-cable/372059 reported that their ratings have increased especially since the election and I think part of their growing audience (if you take away the decline of cable news consumption due to the technological convergence of media) that it can also be accredited to stepping away more from their left leaning bias as apparent from your claim about the former leftist panel show hosts and worked their way to expand their audience more by taking a more centrist approach that may possibly decrease their bias.
I think that MSNBC may not be the only ones to be doing that for the most part because I agree with your list and how a lot of them take a center stand point and I think that its partly because of the (how HeroOfTime5 stated) the modern day yellow journalism phenomenon we have been having especially these past 2 years from the election. Though I still think the other headlines I pulled in my last post were still pretty dumb if I put it plainly. Nonetheless, I stand corrected.