Once "Avatar: The Way of Water" finally makes its way (of water) to theaters in just a few short weeks, director James Cameron will have spent a minimum of nearly two whole decades planning and developing the first two movies in this epic saga -- and counting. With another couple of sequels already far along in various stages of production and tentative plans for the series to stretch to six or even seven total movies, it's clear that the visionary talent has no intention of stopping...