There isn't much that I'd say to get rid of. Sure, the Treehouse is boring, but my kids just saw it for the first time and thought it was really neat. Snow White WAS too scary for them, as I had expected. But personally, I don't know that it should be removed. I did love Mr. Toad's Wild Ride too though.
The boad ride in The Land is one of our favorites. My 6 year old wanted to ride it immediately when it was done. The same goes with Journey into Imagination (I still love this ride as well), Spaceship Earth, and Energy. We love all of them. My youngest absolutely loved Test Track, and was very disappointed that it had to shut down when it rained.
I miss AE, and liked it much better than Stitch. My kids were not scared in Stitch, but they didn't like it (Stitch BURPED ON ME and SPIT ON ME! - they didn't like that, which is amazing for two boys who can walk outside for 2 seconds and be covered in mud, it was just a little water). But, AE would have been WAY too scary for them. Having a character they knew as being mischevious made it do-able for them. Still, for me, I liked AE better.
I agree with other posters who have said that the readers of this board are not necessarily the typical Disney visitor. I know TONS of people who have never ever been, and have plans to go in the near (or not so near) future. Now, having heard of all of these classic Disney attractions, imagine their disappointment in not getting to see them because people (like me) who can't find another place to visit for vacation are getting bored with the attractions.

Updates are needed, rides should get to looking old and ragged. Animatronics should be updated as technology improves (compare the new Jack Sparrow on PoTC to Ellen - BIG difference). Rides that talk about technology/progress/future should be updated so that they seem current. But I like to see the mainstays, actually stay.