I would guess that it wasn't really working. As I said somewhere up thread, people would rather laugh through the Decades when see older dramas and the like. Laughter is timeless.
I think it's very simple: people like to laugh. Comedies from earlier eras are easier to share with younger generations than a serious detective drama or war show. Laughter is timeless. Dramas, just by their very nature, date much more quickly. So a change to an all classic comedy format can be...