OMG...tell me thiis guy is wrong about micro four thirds

Once again: One could certainly translate that (i.e., 108 ppi multiplied by an 8 inch dimension to yield 864 pixels) if they like. I don't really see a significant distinction that negates my points. Note that in all cases when I refer to an increased print/display size, I reduce the the pixels/per inch. Thus, what I am saying does not conflict with your understandable (but not essential) preference of units.

I agree that it depends on the lw/ph of the captured photo. Note that in all cases when I refer to an increased print/display size, I reduce the the pixels/per inch. Thus, what I am saying does not conflict with your understandable (but not essential) preference of units.

Those things are true, but I purposely (as do DOF calculators) left them out of consideration.

Up-sampling creates nothing in the way of image-data, and thus seems not relevant to what I am talking about. I understand the thrust of your preference for lines, or line-pars, per image dimension - but I think that you may be missing how I have presented the pixels/inch units in my post.

Could you look at it again, and try to see that I am not violating your concerns ? Or, if I am, please point out specifically where and how I am ignoring that (regardless of the enlargement-factor between printed/displayed image and the image-sensor surface), what the COC diameter relates to is indeed a physical dimension which bears a distinct relation to the physical dimensions of the image-sensor itself (with a minimum size equal to a 2x2 photo-site array) ?

The specific number of resolved lines, or line-pars, per image dimension will depend on the pixel-resolution of the particular image-sensor (as well as the additional factors which you have rightly pointed out). Again, all I am trying to point out in my post is the importance of a DOF or Hyperfocal Distance calculation being referred to a known, disclosed, and understood by the user print/display viewing-size and viewing distance - so that it is useful for relating to physical distances in object-space.