If Don Hewitt "corrupted" TV news, it wasn't by applying the term "anchorman" to Walter Cronkite. Time was TV networks (and stations) did entertainment shows for money and ratings; news and documentaries for image value or prestige. (In the old radio days, many newscasters and commentators were carried by the networks on a "sustaining" basis; if a sponsor bought in, fine, but the news went on anyway.) But when Hewitt's 60 MINUTES became an unexpected hit, the networks realized that news could be a source of ratings and profits; and the race was on to come up with "something like it" or "something hotter." This led to the whole tabloid-magazine phenomenon and a lot of the TV junk-news today. Serious or long-form reporting has been left to PBS ("let George do it.")
A few years ago I read of a journalism professor who obtained some copies of Cronkite and Huntley-Brinkley newscasts and showed them to his class to get their reactions. The general opinion was that technically, they looked like crap (static camera work, scratchy 16mm footage, slide-projected graphics, etc.) but content-wise, they were light years ahead of today's TV news. In other words, the packaging has become more important than what's inside.