And that's the sad truth.@Xita; The problem is it's just easier to be unoriginal on TV. People would rather go with something that they already know "works" (in terms of getting in viewers, not in terms of quality), even if it sucks, rather than take chances on new stuff.
Glee is a good example. That show has never been great, but in its first season, it was at least something new and original. Nobody had ever had a truly successful TV series musical. But it's long overstayed its welcome, and is basically becoming a parody of itself at this point. Yet, because it's still so popular, they won't ever get rid of it.