Andrew,
If I interpret this correctly, your basic argument here is that high display luminance combined with high ambient lighting will induce the same luminosity edits one would be inclined to make with low display luminance and low ambient light, such that the resulting print would be the same either way, and therefore if correct under one set of prep conditions will remain so under the other. Fine. For the sake of my eyes, when I need to replace my LaCie 321, I still hope there will be high quality LCD panels capable of low luminance values without banding.