Once someone figures out a natural content creation interface, that will be truly groundbreaking. Who knows if it's even possible purely with hand gestures. I forget where I read this, but one of the major factors in precise control over anything is the use of tactile feedback from your fingers, which you just don't get from hand gestures and a visual interface. Disney was even experimenting with air puffs propelled at your fingers to do this. [1]
[1] http://www.disneyresearch.com/project/aireal