I wouldn't really say they are moving to more thrill rides though. They are just adding finally a couple thrills rides. Only like 25-33% of rides are "thrill".
In Epcot it was the addition of Cosmic Rewind but also adding Ratatouille and now cancelled Mary Poppins.
Maybe you consider Star Wars thrill based but you have MMRR plus things like Frozen.
Pandora was split between the two if you consider FOP a thrill ride.
But it's not just Thrill rides. Piccolopat hit the nail on the head.
We have lost The Wonders of Life - which had things about how Emotion worked. How you burned Fat. Where energy came from. All about the human body. We have gained "Play!" where you learn.... nothing?
We have lost The world of Energy - a show about where the worlds energy came from historically and where we were looking to get it in the future. It was a cool fun fact that the entire building was powered by solar - "you are riding on the sun". They attached an awesome dark ride with dinosaurs. We are gaining - a roller coaster based on IP (nothing educational in there). A ton of lost potential.... Energy is a very evolving subject - the search for cold fusion. Micro-reactors which are awesome. Some of the concepts we are using with Natural Gas Conservation. Recent improvements in Solar and Wind. That was what the pavilion was MEANT to be.
We have lost Kitchen Cabaret - which became Food Rocks, which was fine - both about Nutrition and eating healthy. We have gained Soarin - don't get me wrong... I love Soarin... But there is little educational about it.
We lost Imagination - which explored how imagination works and we got a really poor figment ride.
We lost Horizons - about our future of exploration - in Space, Under the Sea, etc. We gained Mission Space - not much educational really. So much lost here with the moving to commercial space exploration.
We lost the World of Transportation - and got Test Track which was originally REALLY COOL - I liked the "This is the car without anti-lock brakes. This is your car WITH anti-lock brakes". They lost all of that education about how car works and the technology behind it and now it's just a ride. So much more potential there unfortunately.... I would love to learn about self driving cars. Hybrid cars. Regenerative Braking. So much new technology to explore, but nope. We get none of it.
Going to the World Showcase - we are losing street performers that teach us about the culture and history of these places and gaining a few rides that do not teach us anything (as much as I love Anna, Maelstrom was always a better ride to me because it taught us about Norway). Ratatouille is just not anything about France as nice as the ride may be.
Lets move to Hollywood studios... We have lost Backlot tour - about how movies are made. We gained Slinky (and I love SDD, but again - education removed, thrill added).
We have lost whatever that area that is now launch bay was called where they taught you about animation. I loved the cool little movie they showed and watching the animators work and gained Launch Bay.
We lost Lights, Camera, Action! which showed how stunts were filmed and we gained GE. Again, I love GE.... but it's not the intent of what HS was SUPPOSED to be.
We lost the Great Movie Ride - a history of movies and gained MMRR - which may be fun and nice, but it's just a ride.
The same could be said (but to a lesser extent) of Animal Kingdom. Much of AK however that has been developed was under-utilized land, so I can't complain there as much.
We are not just losing dark rides and replacing them with thrill rides. We are losing the identity of Disney. EPCOT's
intention was that of education. The Pavilions - each a deep dive into a particular subject - Sea, Land, Imagination, Transportation, Energy, Biology, and Exploration - were supposed to retain and evolve as their subjects evolve - staying on the cutting edge of showing us what we have learned and what we are learning now. MGM's intention was not "rides based on IP" but learning how movies are made - all kinds of movies - and exploration of the world of hollywood. We are replacing all of it with "Oh, that was fun".
{Edit] Sorry for the long rant.... I feel passionately about the subject I guess.
