Interestingly, the BBC's War & Peace from last year was shot largely with anamorphics with a plan to crop to 16x9 for broadcast. I seem to recall reading that they wanted the character of the anamorphic lenses without actually planning to use the entire frame. I'm actually surprised that isn't done more often.
In a similar vein, several years ago, the "failed" BBC scifi series Outcasts was shot anamorphic on the Arri D21, which I think was the only digital cinema camera at the time to offer a 4:3 sensor to take advantage of 2x anamorphics. I think the producers wanted to broadcast in 2.39.1, but the BBC said no. They did however let them use the full 2.39 frame for the "next time" trailers! At the time, they claimed they were the first ever use of anamorphics for a TV production. Just like War & Peace a few years later, the production team still wanted the other benefits of the anamorphic lenses, even if they were going to throw some of the image on the sides away: http://www.definitionmagazine.com/journal/2011/2/10/bbcs-outcasts-get-anamorphic-shooting-but-not-broadcast.html