What's a measurable way to call GE a failure? As a conservative estimated, I'd say HS attendance goes up 15% in 2020. Could be closer to 25% I'd say less than 10% increase would be a failure. I consider TSL less successful because often the standby wait times are less than RnRC - 50 vs. 40 right now. Flight of Passage is at 60 now, but it held > 2hrs for a very long time, and still does when the parks are busy. If the expectation is driving a 25% attendance increase, then it might not hit that.
As a subjective measure, I'd like it to be better and more immersive than the WWoHP. You feel like you're in Diagon Alley & Hogsmeade which is a huge part of the fun.
I did not like Avatar the movie, but I squeezed two days at Pandora around a trip to Yellowstone (we flew out of MCO). I loved the OT. Really enjoy it all. We might be in SoCal in July 2019, and my crazy mind went to...
Now, the interactive elements are more elaborately planned for the hotel, which is a longer-term project. One problem with the immersive experience videos that I saw was that they are very labor intensive. It takes a lot of CMs to drive those games. As opposed to the wand experiences in WWoHP which have virtually zero ongoing labor, although there's usually a CM to help. Automating those experiences is a huge undertaking that I'd imagine they're working on.