Not to make excuses because I don't know the details, but I do know TRON and Velocicoaster have two different manufacturers... that may account for a lot of the differences in construction speed.
I don't blame Disney for wanting to space out Cosmic Rewind and TRON and not pushing to open TRON earlier this year. No guarantees they could have gotten it open earlier this year even if they had wanted to. I think they likely could get it open for December, but would rather wait because December is going to be super busy regardless. Obviously it would be nice to have the extra attraction capacity but I can't really blame them. I am pleased they are not taking Splash down during the busy holiday season before TRON is open. In terms of capacity, it makes sense not to lose one attraction until at least closer to when the other will open.
Disney has been marketing the 50th celebration a ton, though. That marketing is one of the reasons I decided to go this year, so it worked on me and I'm sure it works on others. Even if the actual celebration is lackluster, they are absolutely still going to continue promoting it until it's done. Then they can turn their attention to promoting TRON.
To me the "celebration" is rather lackluster.... someone did a list of things:
- Disney Enchantment... that they are already changing it, says it all.
- Harmonious... again changes are coming to it as well (both of these could use... more Disney)
- KiteTails.... heard that "show" was now more of a they do it every now and then. But highlights there is an empty stadium there.
- Remy.... cute ride that all can ride, much needed at Epcot. Solid B Ticket.
- Beacons of Light.... Epcot's Sphere is the star here, (Castle has always lighted up). Again cute enhancements, be must see?
- La Creperie de Paris.... not hard to make a reservation or walk in, as it's just not what you expect.
- Space 220..... one I was really looking forward to.... Space is rather boring when you sit there for an hour and half waiting on food. Definatley a stop to visit the bar, but beyond that?
- GotG.... really great attraction, if you waited till later in the celebration to catch it.
- TRON.... will miss the 50th celebration.
- Broadway Theater at MK... that was actually announced, but got the ax early on.
100 Years of Magic (not the new 100 Years of Wonder) was a special time for us at WDW. Really had hoped that would be able to recapture that feel.