Disney did announce Avatarland a few years ago. So far nothing has been built or started.
Carsland, Star Wars land..... they are not announced they are just wishful thinking, and to talk about how one attraction will be effected by something that is nothing but a wish is crazy.
Disney's slow reaction has been a great benefit to their local competition.... Universal, Legoland, etc are all putting out some pretty nice quality products... it amazes me of the people I know here in Florida (friends, business associates, etc) who all seem to no longer go to Walt Disney World (and many of them used to go religiously!) and many of them are trying to encourage me to go to Universal, Busch Gardens, etc....
TDO has for a long time seemingly "not cared" about the locals unlike their Anaheim cousins.... which is Just Fine I suppose in their business model when you have the out of area traveller's "In the bag".... but HERE is the thing.... I have friends and family outside of Florida now who are asking "You ever go to Universal or blank?? Hearing good things about that! Kids want to see this or that? I want to see this or that!?"
Add this to Disneyland really starting to pull in the out of area travellers, Shanghai Disney opening its doors in the not too distant future, Tokyo Disney as always stepping up their game, some additions to Hong Kong Disney, and the possibility that Disneyland Paris will get its act together...and YOU have some serious DISNEY vs DISNEY here too. To be honest if I didnt live in Florida, what difference would it make say to go to California instead? or if I lived in a Non-US location why not give one of the other Disney destinations a test drive????
Will Walt Disney World blink out of existence? VERY Unlikely!!! Though the Walt Disney World we do have could be something that is far less loved than we have today.
"A single spec of snow can combine into a cute little snowball... as it slowly rolls down the side of the hill you would not suspect it is something potentially dangerous... If I were standing there I could grab it up and melt it in my hands.....and yet as you watch it roll pass you harmlessly it gathers momentum and in a short time the people in the village below are killed in an avalanche.....
PERHAPS those in power at TDO should consider that as they watch that spec of snow fall from the sky.