Cameron said: "While Curiosity won't benefit from the 3D motion imaging that the zooms enable, I'm certain that this technology will play an important role in future missions. In the meantime, we're certainly going to make the most of our cameras that are working so well on Curiosity right now."
So HE paid for the cameras and owns them?
Presumably the Zoom ones eat more power, might get stuck due to hot/cold/dust or wear out. Certainly would need a lot of testing.
What does a Film Director know about the technology needed for Science?
I guess he does know it's just Stereoscopic and not actually 3D? 3D Motion? Is he expecting Alien life forms? How fast do rocks move?