4D attractions still work.Perhaps when the Zootopia 3d film comes out at AK..Maybe this is a way to revitalize The Magic Eye theater for Epcot to see if 4D film attractions still work in the theme parks..
Philharmagic and Muppets tend to do very well these days... And they're pretty old. I also think that it really depends on location. I have always believed that ITTBAB died off fast because the attraction's entrance is so hard to find for newbies.
Also, theaters like the Magic Eye and ITTBAB are not in a prime location surrounded by other attractions. 4D attractions are great entertainment for waiting around on your next Express Pass, or a break between a bunch of fast-paced attractions. Muppets is close to ROTR now, so I believe that is why the attendance has gone up. Convenient way to pass the time waiting on your callback time/express pass while still being entertained.
Philharmagic has Seven Dwarves, Peter Pan, Small World, Pooh, Little Mermaid, Haunted Mansion, and a whole lot of other stuff around it to justify going to see the 4D film for a 10th time on your 10th trip as you wait for your next experience.
ITTBAB and Magic Eye though? There is quite literally nothing around them without having to walk forever to the next destination. They are very much out of the way from everything else. Nobody needed to watch Captain EO or HISTA to wait to get on Imagination. So its usage on repeat visitors seems useless. Same with Bugs.
Awesome Planet is a non-4d film and has a comedically oversized theater on a simple little film about conservation and it sees more people that the short film festival. It's not something I ever really want to do. But I do it every trip. Why? I'm either waiting for lunch or waiting for Soarin' and don't want to walk all the way over to Imagination or Seas.... Impressions de France/BATB Sing Along has gained a huge audience because of its close proximity to Ratatouille.
It's not about whether or not 4D films are right for theme parks or not. They obviously are... But their re-watchability is much less than a moving ride... So it's not likely that people will go out of their way to go watch it again every single trip... Unless the location is convenient when it comes to waiting on other experiences. Then they are happily enjoyed by repeat visitors.
Hopefully that makes sense.