I know that's why people are excited about retina. I'm trying to say that you cannot simply compare sdtv and hdtv and say that the same thing is happening on the ipad. a resolution higher than 1080p on a 10" screen doesn't mean anything in terms of video like it would on an hdtv because no one would be able to tell the difference between that and a lower resolution like 720P. good attempt though.
that's exactly correct.
However, there will (i'm guessing) be 'apps' etc, made for this that HDTV can't run, so perhaps it is a good analogy, all things being equal.