How Many More Harry Potter Movies ?

Okay I'll admit, I love watching Harry Potter movies, but how many more do we have to watch ? Shouldn't Harry have killed the Dark Lord in the latest installment ? I felt it was dragged out for no reason. Now we have to wait for another two years for another Harry Potter movie to find out if they get rid of the Dark Lord. And please don't tell me for every book there needs to be a movie. Reading books is one thing, but wanting to make a movie out of every one is not such a good idea.