We can argue this all day. Component over HDMI or vise versa. What it comes down to, is that people want 1080P because they are told its better.
I have a 1080P tv, It won't accept it over component just 1080I, but will over VGA with a dvi adapter, but not full screen it wants a digital input for that. The point here is my Mitsi tv looks as good with component at 1080I as it does at 1080p VGA, and Hdmi doesn't seem to make much difference either. The only reason I bought the 1080P tv is I got it cost.
HDTVs can display any video signal. For a 1080p HDTV, even the high quality 720p and 1080i HDTV signals being broadcast need to be reformatted in order to fill the TV screen with a sharp, clear picture. Mitsubishi developed Plush1080p technology to do just thiswith the highest quality possible. It scales the picture precisely, with minimal side effects. And 1080i, currently the most common form of HDTV signal, is spectacular at 1080p. The conversion is precise, resulting in previously unachievable detail and clarity. In short, Plush1080p technology makes everything else look better on a 1080p HDTV.