He seems to have not heard of the latest Volumetric 3D display technology: "time-multiplexing": http://bankslab.berkeley.edu/projects/projectlinks/fastswitc... (the bottommost diagram, labeled "Switchable lens volumetric display.", made practical in 2008. The diagram labeled "Illustration of 3 mirrors display" is a bulkier 2004 technology.)
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Oh wait John does talk about focus! https://www.youtube.com/watch?v=NYa8kirsUfg#t=7m32s
He seems to have not heard of the latest Volumetric 3D display technology: "time-multiplexing": http://bankslab.berkeley.edu/projects/projectlinks/fastswitc... (the bottommost diagram, labeled "Switchable lens volumetric display.", made practical in 2008. The diagram labeled "Illustration of 3 mirrors display" is a bulkier 2004 technology.)