So probably one of the top debates that I've seen happen here on Micechat is when someone says they want either a Marvel or Star Wars ride / land / park and then someone else says that they want something based on an original idea "the way that Disney used to." However, when Disneyland opened in 1955, almost every aspect of it apart from Main St. were based on previous Disney movies and TV shows. Adventureland was created based off of the success of Disney's "True-Life Adventure" series, and was even originally going to be called "True-Life Adventureland." Frontierland was based entirely off of the success of the Davy Crockett TV series. Fantasyland obviously was based off of Disney's feature-length animated films. Tomorrowland was probably the only land that didn't come from an already-existing TV show or movie (as far as I know). There were some futuristic movies and ideas that were presented on the Sunday Night Disneyland TV show (later The Wonderful World of Color) as way to promote the park while it was being built, but to my knowledge, there were no successful TV shows or movies that inspired Tomorrowland the way that there were for all of the other lands.
So are the lands and rides that are based off of existing Disney franchises "original" because they were created by Disney and not purchased from another company? If not, then Disney has never been all that original. Let's go further and look at some of the rides:
Jungle Cruise - True-Life Adventures
Swiss Family Treehouse - Swiss Family Robinson
Shooting Gallery - Original?
Mark Twain - Original?
Davy Crockett's Explorer Canoes - Davy Crockett series
Golden Horseshoe - Original?
Mr. Toad's Wild Ride - The Adventures of Ichabod & Mr. Toad
Peter Pan's Flight - Disney's Peter Pan
Snow White's Scary Adventures - Disney's Snow White
Pinnochio - Disney's Pinnochio
King Arthur's Carousel - Disney's Sleeping Beauty
Mad Tea Party - Disney's Alice in Wonderland
Alice in Wonderland - Disney's Alice in Wonderland
Casey Jr. Circus Train - Disney's Dumbo
Storybook Land Canal Boats - Original?
Tomorrowland - All original?
My personal opinion is that there is nothing truely original, but I do like rides that are not based on specific movies. Pirates of the Caribbean can be considered original or not, because there certainly were plenty of pirate movies before that was built, but the ride itself is not based on any one movie and none of the characters in the ride are supposed to represent characters from any one movie (pre-Johnny Depp). Same with Haunted Mansion, Jungle Cruise, Space Mountain, Big Thunder and Soarin' Over California. However, there are an equal number of rides that I love that are based on specific movies or TV shows. Rides like Indiana Jones, Star Tours, Splash Mountain, Tower of Terror, and Radiator Springs Racers.
So then what it comes down to for me is that a good ride is a good ride, and I don't really care that much whether that ride is based on an existing movie or TV show. So my vote goes for (1) any ride ("original" or not) that fits within the existing theme of the park and the land that it is in, (2) that is enjoyable enough that I am willing to wait at least 30 minutes in line to ride it and (3) that never gets old no matter how many times I ride it. If Disney is able to invest more money into a ride (and theoretically make it that much more awesome) because it's based on a franchise like Marvel or Star Wars, then I'm all for it, as long as it fits the theme of the land and the park that it's located in.