I hope James Cameron gets his wish! Haha it'll align with my wish. But my take is he'd come back to this after delivering Avatar 4, which is a 10 year journey.
It managed to bring in $400M+ on a $170M budget. It'll likely touch $450M with home media and licensing agreements. But if movies cannot profit on a haul that is 2.5x of the budget, Hollywood studios clearly need to restructure their agreements with cinemas.
besides the production costs there are also so much costs for advertising and marketing, i.e. the cost for the movie with evrything was nearly 300 million dollares... the studio bosses think there twice if they will produce another part.