> But the reality of a 20" display at 326 dpi, for 2D, is not useful.

Especially as Windows (or more accurately, programs written for windows) 
don't seem to handle using higher DPI settings (typically icons and 
fonts get lost off the side of windows).

> For a 20" display, that would make the pixel unreadable.
> (usual pixel size is between 0.2 and 0.3 mm, which is about the
> classical 72&  100 dpi of fonts)
> Pushing to 200 dpi in 20" would still be a frivolous move.

Some specialist-use displays (medical, xray scanning, aeronautical etc) 
push up to 200 dpi in large format (2048x2560 seems to be the common 
resolution), but you're talking $10k for these which means they're not 
going to catch on for home/office use any time soon.

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