My kids are nine and are picky about what they'll read because in some books the tension is too high or the fear-factor too scary. So that means even though they can read at the HP level, they aren't interested. But they've read almost all the Lemony Snickets. They stopped partway through Alice in Wonderland, and Percy Jackson and the LIghtening Thief. But they are interested in finishing both, although some of the parts are scary and they need to take breaks.
They're also picky about the movies they'll watch. We havent gotten to the point where we'll fast forward through the bad parts. We just skip the whole movie. But we dont feel like we have to watch every movie that comes out.
As long as it passes your parental approval, from that point it's up to the child. I expect my kids will be reading HP later than most kids, and that's okay too.