Just wanted to say that I'm in the twenty something range too, but I only consider Potter as a annoying little blip of my preteen life. I read the first 4 books, but by then I had graduated to reading adult authors. I can't stand Potter now...Star Trek was a much larger part of my childhood
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I still only see HP as a fad...and that Uni jumped on the bandwagon. Albeit this fad has been around for 11 years now, but I still don't think it has the staying power of Star Wars and/or Trek. And when I read that Sentinal article, all I really got out of it was that Disney wasn't releasing their separate attendence figures and that attendance is pretty much flat, in the meantime Uni is up. I failed to see how that means Uni is making a difference on Disney though.
Rates on mortgages are very good now btw you should look into it!