From TMP:
There are some movies so great, we desperately want a sequel in order to see more...but that’s not always the best idea. Sometimes the story is too self-contained or the characters have moved on to another life, but there are valid reasons for some films to be left alone. So we've compiled this list of films we want sequels for, but should leave alone.
Bros Review: The series, as the title suggests, is about two adult men who want to behave like children and we are not here for that.
Going Home With Tyler Cameron Review: This is a simple, no-nonsense but cliched watch, with Cameron's boyish charms taking centre stage.
Kaam Chalu Hai Review: Based on true events, this movie is thought-provoking and inspiring
None of these would work as a sequel in any meaningful way.
Nick Frost's character in Shaun is a zombie, Inception was good because it was something new and a sequel will be been-there-done-that. V for Vendetta? Yeah right.
Exactly M_D, exactly. That's why they just wouldn't work, and as such, they really need to be left alone. As great as they all were, they work best as stand alone films.
I didn't like Watchmen to begin with, however I could semi see it happening. 300 also didn't have source material but they are going back and making a prequel to that. Deer god I know.
However with Watchment it's a comic book, and if you get some comic book writers on board you can continue it. Have them write a few comic books, maybe another video game, etc...see how these stories work with the fans. if they like them, then go ahead with the movie.
However being i didnt even like the first one, ill pass on it either way haha.
Cloverfield....man, that movie just felt unique.
Unbreakable 2: There is obviously a lot of potential for them to expand on the original but I don't know if I trust Shamylan enough at this point not to totally botch it.
And I believe heard Nolan express some interest in making a sequel to Inception, but I think it's a bad idea. Let's not break down the layers of the first movie; leave it open to interpretation.