I don't know,... but I've noticed that the less expensive and smaller TVs with VGA ports are usually 720p vs. 1080p. Pretty much anything at 36 inches or less, and under $500 retail, isn't likely going to have a (TRUE) 1080p mode, even if it has a VGA port. Some of them have a 1080p mode that is just a scaled 720p, but it's not natural resolution. But then you end up with a fuzzy picture, scaling effects, and margins that don't quite match the edge of the screen.
I agree that for most people's main TV (and maybe one other) they'll have one that's 1080p capable on its VGA port,... but for additional TVs (kitchen, kids' bedrooms, rec room, man-cave, etc.) people tend to opt for something in the 26 - 36 inch range. My plan, for instance, is to have 6 MDs (have 3 so far). When done,...only two of the TVs are likely going to be 1080p capable. I have 3 TVs now that are 36" or under and only have 1360x768 or so natural resolution,... not including the cheap, $86, 14" TV that I use for the monitor on my Core (I think that one's even less than 1360x768). Two of them don't even have VGA ports,... only HDMI and composite (besides coax).
I think as a lot of people upgrade components, they'll tend to shift their older MDs out to the kids and the other areas of the house where it would be nice to have LinuxMCE functionality. But that doesn't necessarily mean dropping $700 - $800 (or even $400 to $500) on a big and capable TV for those areas, when a $250, 30 inch one is a better physical fit and can do the job fine.