I don't think it is the prime time news anchors that is the problem, it is the content that they are covering.
Sorry, but when Shep Smith has a full segment on Natalie Holloway in Aruba, followed by O'Reilly with a full segment on Natalie Holloway in Aruba, followed by Hannity and Corpse with a full segment on Natalie Holloway in Aruba, followed by Greta's FULL SHOW of Natalie Holloway in Aruba, WHY SHOULD I WATCH ANYMORE?
People(both men and women I suspect) desperate for some semblence of real news flocked to Fox early on. There should be no reason for a slide in viewership unless they themselves have changed. Their competition doesn't appear to have done anything to recover their losses to Fox, so I'd guess there's something else at play. But whadda I know.
Ailes should recall who brung him to the dance.