Future movies may be using a different type of motion capture technique than we are used to today. rather using a camera to record the motion of a person or object, actors may be wearing numerous outward-facing cameras on a body suit.
not the brightest idea. Taking a day to render a minute of footage is going to make dailys rather impossible. With current tech they can instant render fairly accurately, and it could be adapted to the great outdoors... but why would you want to? The idea of mocap is to capture the animation of something to be animated, so you would want to do it in a studio.
Is the render result already simplified for animators to use? On the other hand isn't it possible to create a very light articulated exoskeleton structure with sensors instead of cameras to measure the actor's movement? Maybe is not that easy, but why? The sensors could produce very high precision.
This coupled with the current motion sensor technology could be an excellent way for movie productions to improve the movement of their animated CGI characters. It always seems like they miss something with the fluidity of the motion of real objects. This might fix that...