@Jon Jacobs Auto-ISO in M mode is a frequently requested feature among still photographers, and many other camera manufacturers have had it for a long time. It has a number of useful applications. For example, when shooting sports on a field with some variation in light (shadows in an area of the field), you could set your shutter speed to capture the action without motion blur, aperture to ensure enough DOF, and allow the camera to adjust ISO for a proper exposure.
And if you can accept that auto exposure (P, S, or A mode) is ever acceptable for videography, then surely you could think of a use for it in video. Set shutter speed at 1/50, aperture for whatever DOF you're looking for, and then allow the camera to moderate ISO to keep a proper exposure. But it seems like you're of the mind that any time someone is shooting video with a DSLR they can NEVER use any form of auto exposure in any circumstance. I think that's a bit short sighted, but I guess you feel pretty strongly about it.