I wouldn't be averse to (at a later date) bringing back general threads for movies and TV shows that don't really require their own threads, but I think for now we should see how it goes and give some time for people to create some new threads for things. And of course, if those threads were to exist but certain discussion was more extensive that just a couple of posts, they could be extracted into their own thread.
I'm honestly finding it quite useful having the TV and movie stuff separated out. Scrolling quickly through the threads that haven't been active in a few months (and I missed the shows when they were on) but I have caught up on them subsequently. I'm sure others are like me, and so I expect activity will therefore be more than it was in those threads before. Whether it's ENOUGH more to warrant keeping this sub-forum, I don't know, but it's worth a shot. I definitely see myself being very active in there.