Hmm
I can imagine this game could be played with Gem atleast as good as with Natal.
They have to show things which cant be done with Gem/Wiimote this is not really impressive.
This reminds me of the Virtual Boy. Nintendo has actually a device to make 3d graphics but the games doesnt need to be 3d.
Another thing is how long can you play this way. This is not revolutionary at all.
How they are going to use Natal in Fable thats interesting.
It could go either way fail or be a success. It depends on the software.