I find it kind of funny that Google is now using a system that was invented so long ago as a joke. Why not use any of the other system to capture 360 3d images? Why did Google decide 16 cameras was the right way to go?
The only reason I can think is you might get higher res images out of 16 cameras than with only a few and a hemispherical reflector or a motor, but is it really worth the extra cost and points of failure?