Yet, the same could be said of creative series. I can still re-experience Battlestar Galactica, and just as Disneyland can change when they add new rides, so too can BSG when the producers add new material (Caprica and Blood and Chrome, for example -- though the former wasn't all that
great). The same is perhaps less true for book series. Though J. K. Rowling can certainly return to her world, it's not as likely that she will, or that her return will garner the same attention as before. We are notoriously overly critical of authors who return to their favorite worlds and try to tell new stories within them. The completion of Harry Potter, sadly, puts Rowling in a strange position as a writer: on the one hand, she wants to please her fans, who are clambering for more HP, but on the other hand, she wants to move away from that to new things (to make a new "name" for herself).