I doubt people care about picture quality as they watch SD channels when the HD version is available. Norms care about having 1 box that they plug in with the fewest number of cables and works well enough they don't need to buy something else. Geeks want a display, norms want a TV.
Of course I want a new firmware board for my 5 year old HD TV which sends the wrong resolution data to my pc, has a terrible SD UI, and doesn't decode HD OTA signals, but it's not going to be cheaper than buying a new TV
Of course I want a new firmware board for my 5 year old HD TV which sends the wrong resolution data to my pc, has a terrible SD UI, and doesn't decode HD OTA signals, but it's not going to be cheaper than buying a new TV