The question I have (and playing devils advocate) is just what is meant by “Wide gamut high end displays often times don't calibrate all that accurately using standard colorimeters.”? You ask for D50 or D65, or CCT 6500K and the results are off a fixed amount? And if so, is this a big deal? The numbers are just that, numbers. Do we all agree that by asking for D65 from the same device using differing software packages we get D65? Or that we automatically get a match to the print? I find I have to start at some value, then massage the values to get a visual match. If my NEC SpectraView matches my GTI booth when I enter CCT 6750K because D65 and D55 didn’t produce a visual match, do I care if its really 6750K or any value as long as they match?
I’m not suggesting having filter matrices that can be updated are not useful. Or that having a Spectrophotometer being used as a spectroradiometer that could measure blacks as well as a colorimeter would not be a good thing. I’m wondering if the lack of these things is a huge big deal making it impossible to calibrate a display to produce a match?
I think the issue here is not to tune the display to visually match a certain white point target (or to get a colormetric match, if this is desired for some reason).
The issue are the high saturated colors current colorimeters are not able to measure accurately. Software correction tables (as in BC Display, iColor Display or Color Navigator) being designed for colorimeters that are actually only capable of measuring ~ sRGB primaries are a good workaround... but they are just that: a workaround. So if the measured gamut of the display stored in the monitor profile is too large, everything looks de-saturated, if it's too small, everything looks over-saturated. Now, if the greens are too de-saturated, the blues too saturated, the yellows have a slight color shift towards red ...and so on ... it gets tricky to manually fine tune the monitor hardware (i.e. the color chanels) to get a good gamut representation of the display. It's doable, but it's not exactly as one would guess it's supposed to be.
So a measurement device that is capable of measuring higher saturated colors and at the same time a more accurate grey scale (due to temperature compensation... which is in fact a serious issue with colorimeters) is basically a very good thing... IMO.