Re:3D Anime... (Score 1)

You couldn't have put more wrong things into your post if you tried. From: http://www.animenewsservice.com/archives/yukito.htm

MNS: Many fans have wondered, why were only 2 anime OAV episodes produced in 1993? YK: It was based on the plan proposed by the animation production company. It might have been better to turn down the plan and wait for a better adaptation proposal to come up, but back then, I couldn't afford to review the plan coolly. At that time, I was still serializing the work and was so busy that I wasn't ambitious to make it into animation.

James Cameron had nothing to do with the lack of continued anime adaptations. That was purely due to the manga artist. Secondly, contrary to the impression you seem to be under, James Cameron only bought rights to do a film adaptation of the series, he doesn't own the actual rights to the series itself.