At the risk of offending people, the answer to this question is: only idiots still watch shows like Shark Tank -- and only idiots haven't figured out how to watch TV illegally online at more convenient times. Nielsen ratings self-select for stupidity. (This is theoretically going to change in fall; they're expanding their ratings formula to include some other mediums.)

The absolute tragedy of all of this is pointed out in the article -- it took shows like Firefly, martyrs for the cause, to bring about a change. The statement "all your favorite shows are ratings disasters" could never have been true before, because those shows didn't last like Breaking Bad has. TV as a form of entertainment is undergoing cataclysmic change (finally) -- see House of Cards, which was released season en masse directly onto the Internet. TV is following the music industry in glacially entering the 21st century. Hopefully films are next.

EDIT: that was the ugliest article I've seen since everyone used Internet Explorer.