I think there's very little chance of them selling the ride to anyone. It has a bad reputation and it killed someone. It's a black sheep, unless CF gives it to another CF park.
Even if Disney sits on the Avatar IP, it's better than letting any competitor have it. I have a hard time believing what amounts to basically one unsubstantiated source in the article, though.
^ Mostly because there's no actual rumors, just people wishing for what they want. The only two facts we have are that PP is getting torn out and that the water and bridge will stay. Everything else is people's wishlist.