<p>^^Yes, except for the “bring diseases” part. I doubt that life forms that arose and evolved completely separately on different planets could share diseases. For all we know life on Pandora does not even use DNA as a template. The chances that their germs could infect us and vice versa is pretty remote. But on the other hand, in Hollywood anything is possible. Logic and probability do not necessarily carry the day.</p>
<p>My prediction for the future: Avatar II - the bad guys come back with a new, even more terrible weapon and gain the upper hand. Calamity ensues. Avatar III - a resitance movement is formed. The intrepid Na’vi, aided by a few sympathetic earthlings, triumph in the end.</p>