User blog comment:Gideoncrawle/5th Wikiversary: Times Have Changed/@comment-3483396-20150209062145/@comment-1874924-20150209071405

I wouldn't call TD a "fad", but most TV shows do have a limited lifespan. Only a few become enduring cult hits. More to the point, TD targets a fleeting demographic, in this case a relatively narrow age range. From what I understand, TD still has a lot of fans, but they're mostly not the same people who watched the first couple of seasons when those seasons first aired.