Lord of the Rings, Dr. Who, and Star Trek are nice properties but they have the same problem that Avatar has - they don't bring in the kids. In the end, people forget, and maybe even Disney forgot with the Avatar deal, 80% of theme park goers are families. Adults will spend money on some things, but nothing like what they will spend on their kids. That's what you have Harry Potter. You go there you don't see hundreds of adults in the yard robes, it's 100s of kids. Star Wars has the same thing going for it. Sure lots of adult fans here too, but the key is the kids.
The one big issue that may hurt Galaxy's Edge, how in the world do they handle the crowds. Will they need to even set up land entrance times, where you book a FP just to get into that part of the pArk. If Pandora is opening with 5 hour waits, how do they prevent 12 h o ur waits for these rides? It's quite possible we'll see the first ever fastpass only rides, which will still leave a lot of disappointed day guests.