Potter's largest factor to its popularity will always be the books - and I think I can very safely say that the books themselves will last far more than the Star Wars films. That's what will make Potter last longer than Star Wars in the end - the books. These books have become classics, and they can be adapted into film with each new generation. The same cannot be said for Star Wars (unless they make new ones, of course).Even when comparing the film series, Potter in many countries has always been a larger cultural event than Star Wars - including the OT (Germany, France, Australia, Russia (obv), Japan, China, etc). As for the Potter books, they were, in the end, a larger cultural event than the Star Wars films. I mean, 400m copies sold in 11 years (450m now), that's just staggering. But even in films, The Lord of the Rings isn't something that can beat Star Wars or Potter. It's true, because there have been countless people who work at stores that said parents buy those two series to introduce to their children. As much as I love LoTR, and as large as the films were, they never had the cultural impact of those two.