Yeah, the claim seems a bit specious. If capacity concerns drove the decision, then wouldn't they have built a much higher capacity ride (even if a clone) than Tron? Ratatouille works in that sense because it does have quite good throughput, but I'm under the impression that the main driver was that they felt they needed something in France to enhance the views and they basically chose between Ratatouille or Tokyo's BatB.
But back to Tron, they could have cloned something else that has somewhere above abysmal capacity if that was the driver (off hand, say, Monsters Ride an Go Seek or Indiana Jones in Adventureland) of the green light. Or they would have actually built the Main St theater.
The longer you wait the more expensive a clone becomes. Codes change, internal design standards change, operations change, even guest expectations change. While plenty of people still think a wheelchair can get them “front of the line” access it would be a lot more shocking if Disney in the 2020s opened an attraction without an accessible queue. Nothing is perfect and lessons are learned. The reason Transformers: The Ride – 3D at Universal Studios Florida was able to go from decision to opening in 13 months is because Universal’s senior leadership made the extraordinary decision to truly replicate the ride and apply lessons learned in Singapore and Hollywood after the fact. It allowed for an incredible pace but it was also somewhat backwards, if you know you have a problem you fix it not replicate it. TRON and Ratatouille are not just clones, they’re “lifts” because as much as possible Disney was trying to do the same thing, “lift” the attractions from Shanghai and Paris and drop them in Orlando.
(See Page 6 for phases of design). Cloning recent projects like TRON and Ratatouille at best get you most of the way through schematic design (about 20 - 25% of design). The more time it’s been the more you skip back towards concept. The newest version of the Indiana Jones Adventure at Tokyo DisneySEA is now over 20 years old. Even using Dinosaur (since it exists in Florida) as a basis means changes, as there actually are small differences in the ride layout which impact show set design. But it’s not just the physical facility. While not consumer technology, ride and show control technology has evolved over the past 20 years. The EMV is also a proprietary vehicle that hasn’t been built in 20 years, so you’d have to bring that design up to contemporary standards and then get someone to do all of the custom work to build these customs vehicles with their new custom controls. Disney isn’t going to buy Intamin’s imitation EMV. TRON on the other hand is a Vekoma motorbike coaster that Vekoma currently manufactures. Those parts are essentially available. Ratatouille is also a proprietary vehicle design but it’s more recent with more recent iterations (Rise of the Resistance and Mickey and Minnie’s Runaway Railway) as well. The EMV just hasn’t been done in 20 years.
Monsters Inc: Ride & Go Seek isn’t as old but it has two different issues. The relationship with the Oriental Land Company had fallen because it was felt that Disney used them to finance research and development by requiring them to spend more. It wouldn’t make sense to literally do just that and use an attraction the Oriental Land Company paid to develop as your quick and cheap addition right when you are trying to rebuild that relationship and get them spending again. Then there is the Catch 22 of marketing (I’ll get back to this) where a less interactive tracked dark ride next to an older interactive tracked dark ride immediately following three trackless dark rides isn’t going to look that good, especially when it’s opening coincides with the big 50th celebration. These four rides would have all opened in the span of 3 - 4 years, one right after the other. (And yes, I’m aware that Tokyo Disneyland has Buzz Lightyear Astro Blasters in the same land as Monsters Inc)
The Catch 22 of marketing is what really killed the theater and anything else that might really help capacity. Disney’s costs are so out of control that they can’t afford to just add something. They have to make things worse and induce some demand in order to justify the insane costs. What once bought Expedition Everest now can’t even buy Pixar Pier. A roller coaster is an easy sell that shows up on surveys, a theater with an indeterminate show is not. The Main Street Theater also still needed a lot work. Just look at the “art” that was released, it’s a very rough digital model. They didn’t even bother to have someone repaint it.
TRON was also originally pitched as a Magic Kingdom co-development project. The seeds were already there. That you had to go so far back to think of other things to clone demonstrates the limited options. The only other attraction developed in the past decade or so that doesn’t have an analogue at Walt Disney World are Mystic Manor and Pirates of the Caribbean: Battle for the Sunken Treasure. The Hong Kongers are protective of their uniqueness, so it doesn’t seem wise to clone Toy Story Play Land in Shanghai, imitate Toy Story Play Land in Orlando and clone Mystic Manor all at the same time. Battle for the Sunken Treasure is very expensive and having to rides named Pirates of the Caribbean right next to each other seems doubtful.
Ratatouille’s placement was heavily influenced by the Skyliner but it also wasn’t a big enough issue to justify more costly additions to the project. Going the route of co-developing Beauty and the Beast would have blocked some views but it was the less assured one in terms of cost.