I agree that the prequel trilogy didn't offer nearly as many (if any) classic memes like the OT did. I also agree it'd be wonderful to see new Star Wars movies, and better done.
But, as has been pointed out, I don't think Star Wars will lose its relevance. Heck, Tolkien hasn't lost his relevance despite only having a few works that came out half a century ago.
However, it would be great to see new SW films. I actually think there's a good chance of that happening. Even if Lucas says he's done, no more movies ever, once he dies, whoever inherits the franchise will probably make more, given how popular Star Wars is - it's easy money. Granted, unless there's top talent involved, they still won't be as good as the OT, but hey, Star Wars is Star Wars!