Original attractions, by their very definition, are abstract and difficult to imagine. Would a guest ever request an original attraction over a "Disney" one? No, because an original attraction has no details. You are comparing a non existent idea to a set of characters that are already a known factor and liked. Of course they'll choose characters!
But let's rephrase the question. Do you want attractions like Snow White Mine Train, or Space Mountain? The answer will become more mixed. Even in Space Mountain's dire state, it remains one of the most beloved theme park attractions of all time. Why? Because it seamlessly blends story with a great physical experience(or did... even my young body can only take so many spins). Would you take another Expedition Everest? It's a nondescript ride that is easily one of the most beloved at Walt Disney World. Once the question is rephrased, you will often find more mixed results.
Let's take a look at Tron Lightcycle Power Run over in Shanghai. It's the number one attraction at the park, and it features an IP connection... But actually few (any?) of the Chinese know Tron the franchise, essentially making it an original attraction. It's being built right now over at Magic Kingdom, even though Tron fans are probably fewer than Disney theme park fans. Yet I'm willing to bet it will be have the longest lines for years to come.
IP as a driver of success is terribly overrated. Build a really incredible attraction and people will enjoy it. If you let said ride decay for 30 years something shocking will happen... People won't like it anymore! I'm willing to bet if Pirates of the Caribbean: Battle for the Sunken Treasure received the treatment Space Mountain or Spaceship Earth received over the decades people would start complaining about it.
What's the difference between the oft hated DinoRoma and the beloved Toy Story Land (besides DinoRoma's clearly superior build quality... never have I seen such a poorly built land then TSL. The place was falling apart. The caulk in the bathrooms was smeared around. It looked a little bit better when I went recently, but I was shocked they shipped that as the Disney Difference... Though all the effects on Slinky were broken this time. One step forward two steps back)? IP has allowed the 20 Toy Story attractions around the world to go on, even though they're mostly carnival crap or some of the worst attractions at Disney. IP does allow WDI and Walt Disney Parks to be lazy and ship mediocre stories.
Why didn't people like Ellen's Energy Adventure? Probably because it was 20 years old and effects were breaking down. Why didn't people like Maelstrom? Probably because it went 30 years without a substantive update. What about the Great Movie Ride? Maybe because most of the films featured were from the 80s and older (nothing appeals to young people like movies they have never heard of).
There will be misfires. Like any art, an original attraction can suck. We need only look at Imagination versions 2 and 3. But there will also be incredible highs, like Pirates of the Caribbean and Space Mountain that make it to the heart of popular culture far more than Radiator Springs Racers ever will. Why? Because Radiator Springs Racers is extension of franchise and not a real experience.
So don't be surprised when a young family comes to a park with only six 30 year old rides that have been poorly maintained, and then asks "where's Mickey?" Disney seems to have a new theme park management strategy. Spend billions creating or updating attractions and then let them decay for a couple decades. Then repeat. Never mention the "m word," (maintenance) and don't even think about iterative improvements.
Let the paint peel and the park become tired, because Rocket Raccoon and Ratatouille are on the way!
Walt did not go into Disneyland just with the idea of making money, but he definitely went in with the idea of making money. He wanted to be creative and innovative and high quality, yes. But he ultimately wanted to earn a tidy profit as well. He was not blind to what would draw the crowds in. Yes, sometimes you have to take a risk on some creative endeavor, hoping that people will like it and it will make money. But you can't always do that or you will go out of business.
Disney's direction in the parks has been chosen because all of their data they have available is telling them that it's the direction that the consumer wants. And, trust me, Disney is one of the best organizations on the planet at gathering customer data and making effective use of it. Disney is not putting more IP in the parks because they hate original attractions. They are putting more IP in the parks because their research is telling them that a Star Wars ride will draw in more customers than a brand new, original attraction. And in most cases, I would bet that they are correct.
I am the first to admit that the entertainment industry as a whole has become too conservative and unwilling to take risks. It is why we see an endless slew of Marvel films, Star Wars films, and remakes of classic Disney films as 99.9% of the output of the studio side of Disney. No one wants to be the one to take a risk anymore. And I do wish that entertainment companies would get back to taking more risks. Even so, though, I acknowledge the realities of business and realize that the average visitor to Walt Disney World is not clamoring for original, non-IP content, just as the average consumer is clearly happy with the 2,458th Marvel film.
For a man looking to make a profit, he invested in a lot of moronic businesses. Disneyland was the height of stupidity, until he decided to outdo his moronic bet by making an even more moronic bet to create EPCOT. Yes he wanted money, but that was secondary. Call me a "fanboy," but I really do believe that he put story and his values first.
What did the public do before Marvel Studios? I mean, what did we watch?