I have absolutely no doubts that avatar 2 will break out whether its with an insane OW or long ass legs. But I don't think a sequel is going to do any good if they aren't spaced out farther apart.
Say what you want about avatar and Titanic but they are honestly the best quality movies of the top 10 or so. not to mention they aren't even a part of a franchise
DHP1 is good if you watch P2 right after. Imagine having to watch them camp and dance for almost half the freaking movie! That said dobby scene and the opening scene were amazing.