I think you will have to ask an admin nicely to delete teh duplicate - I think thread starters used to be able to delete them but not now - I tried to delete a thread of my own which noone replied to.
I don't think you can complain just because you haven't any replies! It is always a little disappointing but your thread if it is the one concerning "Bewitched" is a rather specific one. There aren't so many downers who were around in the sixties and I am one of the older ones and I have only seen the odd repeat of this show and not enough to comment. If you want a lot of replies try a more general subject maybe.
Also maybe try to contribute to other threads and raise your profile. I can't speak for others but I tend to make more effort to check out threads by people who I have notices have interesting things to say. It is quiet on the forums but don't give up!