Lasseter was apparently one of the people who ensured Cars turned out as well as it did and got the budget needed. And apparently one of the reasons he was able to do this is because he is a high tier figure at Disney and has collected a lot of political leverage and dirt to threaten the corporate heads with. I doubt Cameron has anything like that kind of power to get the job done right. There were passionate creative people who actually had political power at Disney that fought to get DCA the quality it needed to succeed. And besides Tony Baxter and perhaps a few others (who still haven't been very successful at turning WDW around so far in spite of their efforts), there don't seem to be many people interested in standing behind WDW. I doubt Avatar is going to have anyone with that sort of political power willing to fight for its quality. It doesn't matter how creative, charismatic or good at begging you are. As mentioned in regards to Tony Baxter on these forums, what matters at Disney is how much dirt you can dig up and threaten the leaders with.
There's also the fact that DCA was in a truly dire state attendance wise before the makeover. I don't know the exact numbers offhand, but while i'm sure it's lower than it needs to be, i'm guessing AK still isn't in as bad of a situation as DCA was pre-makeover. Disney is also well aware that modern WDW guests are easier to please and manipulate than Disneyland goers, they have lower standards and don't band together to protest for quality like Disneyland goers do (this most likely because a huge amount of modern WDW guests probably never even visited the parks prior to EPCOT's mutilation or have little to no experience with any other Disney park to know better). The corporate heads know that what they can't easily get away with in CA, they can much more easily get away with at WDW.
So basically my point is that there were a lot of factors ensuring quality at the DCA expansion that i'm very doubtful are also all present involving Avatar Land.
