I dunno that it's fair to say that anywhere near 1 in 3 people doesn't want to be there. This is not just some kids movie. When I went to see it, you know what I saw? Teenage girls my age giggling excitedly. A couple rows in front of us were 4 full-grown adults, a couple of which looked middle aged...no kids around them at all! They came all by themselves.
Well when I went to the movies with my parents I didn't sit with them. Just because people don't have kids sitting next to them doesn't mean their kids aren't there somewhere... though I'm sure a few adults did want to go by themselves, but still very very few.
As for LOTR. It'll pass Harry eventually. Not a doubt in my mind. It will gross more overall. LOTR has had decades of waiting and it has a fan base stretching generations. It might take longer, but I think it'll pass it. (this is of course assuming it is actually a good movie, hollywood has butchered plenty of books).
If LOTR doesn't pass Harry it'll only be because less people saw LOTR
twice. but if there were a way to count unique people I'm sure LOTR would come out on top.
By the way I'm also counting video sales/rentals in on this. Alot of Harry's traffic is going to be families. Mom Dad Sister Brother. Thats 4 people from one family seeing a movie. So while many people may be seeing Harry the fact is that its a less amount of families or households than will see LOTR. So when it comes to buy or rent movies, whereas each family needed 4 tickets, they only need 1 movie.
If there is a way to check on retail sales of movies/dvds I'm betting you'll be suprised when Harry comes out. Compare sales of Harry to TPM and you'll notice a suprising differance. It won't be proportional.