As much as we all want the best available picture, even if D*, E* or the cable systems were to deliver 1920 x 1080 pixel resolution, most of the HDTV sets, owned by consumers, couldn't take advantage of it. Yes, the some of the newer ones are coming out with the capability of receive 1920 x 1080, but the vast majority of the ones out there today have a max resolution of 1080i.
I think the providers feel that currently it would be a waste of bandwidth to send their signals out at 1920, for such a few customers. I believe they will go to higher resolutions, as more 1920 x 1080 TV sets are available and they have more available bandwidth, on their satellites. They will eventually be forced to it, as customers that want high end HD, will go for the company that offers the best picture.