I for one think that Disney need to put Avatar on hold for at least the next four or five years because Epcot is in dire need of such attention and here are the reasons why:
Mission: SPACE is lame and Horizons need to be rebuilt.
Something needs to go in the Wonders of Life pavilion.
Universe of Energy with Ellen is way too outdated.
Nemo needs to be booted out of Seas pavilion and the Hydrolators and Sea Base Alpha returned.
Dr. Channing and the Imagination Institute needs to go and Dreamfinder needs to be brought back.
The upstairs imageworks needs to be reopened.
The World Showcase is long overdue to have a new country.
No need to refurb Spaceship Earth or Test Track.
I'm sorry Disney and to you guys, but Avatar can wait because Epcot need a major overhaul more than anything else at WDW. Besides Avatar is not going to be the Potter Swatter that Disney was hoping for.