I don't think HDTV was ever a novelty, actually. I consider them to be completely different entities.
I agree - HDTV was much rarer, much more expensive not long ago ,but that's to be expected with every new technology. If we ignore the economics side of it though, HDTV offered a much improved experience to the viewer, with no change in how they watched things and none of the funny glasses, light loss and dulled colours that current 3D technology offers.