You're so quick to write it off. Perhaps it's because of the fact that you're not a Harry Potter fan and are just upset that Disney actually got beaten at their own game? Harry Potter is going to be sticking around for sometime. It will be up there on the shelves with Lord of the Rings and The Chronicles of Narnia 50 years from now. J.K. Rowling isn't dead yet. There's nothing saying she couldn't write more material. Not only that, but Pottermore is still in it's infancy and she has confirmed she is, in fact, working on an encyclopedia of the wizarding world.
George Lucas himself said that Episode III was going to be the last Star Wars film...well look what happened there.
No one can see the future, but to blatantly deny what's practically slapping you in the face is utter lunacy.