Yes, but what matters is that your son has, not you. You are the older generation, no offense, and it would be his generation that will pass on the love of Potter to their children the way you did with Star Wars with yours. I've read them, and I know that I will encourage my children to read them. I know many many many of my friends who have done this already, or will do it when they have children of their own. I think you underestimate how Potter impacted this generation of children... Not surprising sice you haven't read the series or seen the movies. (Not knocking that you haven't. Just saying it is hard for you to understand the full impact having not experienced the series.)
I've repeated before, I think HP has a very good chance of lone term success. Fantasy series seem to have a better chance of longetivity. Look at the Chronicles of Narnia or Lord of the Rings... That sucker was published in 1954. Now the movies helped repopularize it, but the fact is that it has always had a large fan base. I see Potter as having a good chance to do that, not only because it is a good story but it is also an easier read, not to mention the cultural impact it has had, much like Lord of the Rings, or yes Star Wars too.