Honestly, I've never seen the Avatar movies. I mean, my husband was watching the first one years ago and I was in the room but totally ignored it. I tried to watch but then just got bored and played The Sims or something. Ha! So I have no interest in Avatar. Saw the land in WDW and didn't care much either way for it.
As for coming to
Disneyland parks...I'm just "meh" about it in the same way I was for Star Wars Land. Neither one is my "thing." I will only really care if they replace things I love for it. (Like craptastic Avenger's Campus killed Bugs Land.) I've seen talks of it going into the Grizzly Peak area and I would honestly be super upset if this happened. It's one of the nicer themed areas of the park, especially since it changed over from Condor Flats years ago. And as someone who recently bought into DVC at the Grand Californian...I'd be pretty annoyed to have to enter into Avatarland from the hotel. 1st world problem, obviously. But it's just not the vibe I like.
If the put an Avatar land in the Hollywood Backlot area...I'd probably be okay with that. Monsters Inc is cute but nothing important to me.
I saw someone mention it could be built in DisneyIand where Autopia is. This would literally make me cry...as dumb as that sounds. My son is autistic and that's one of his favorite rides. On our last couple trips, he's wanted to end each day on Autopia. So I can't imagine it being gone. Though I know it isn't a super popular E-ticket so most people wouldn't care.
If it goes into the Disneyland Forward space....I'm mostly indifferent, I guess. I'd obviously much rather some other themed land but at least they wouldn't be demolishing things I already love!