I actually don't think appropriate infrastructure exists to make every camera high speed. I mean the camera itself is easily $150,000+ and then you'd need the systems, storage, switches and everything to support the output. The sort of storage and PCs needed for slow motion are very expensive and I'm not sure the interconnect systems would be good enough.
Haven't we already had it, I seem to remember 'super slow mo' or similar a few years ago.
