This would be a cheap and easy way to keep the land fresh. I'm thinking that it probably happens at some point, but we'll see.
As for Pandora as a whole, Pandora is one of the most popular things about DAK currently. So while DAK needs more things, i'd personally prefer that they focus on the Dinoland USA plans of revitalizing that area and maybe in the grander scheme of things add a third ride (which was initially rumored to be a coaster when it existed when the land was in the design phase).
What i'm more curious about is that now that Avatar has proven to still be a box office draw all these years after the original film, will Disney build cloned lands (or even just a cloned version of FoP) anywhere? The top two international markets interestingly enough are China (as expected) and France (having generated almost $100M so far). That's two opportunities for theme park integration between SHDL and DLP Resort.