People don't want UHD/4K
They don't even appreciate HD, why else would they put up with all these services both streaming and broadcast which provide crappy over-compressed video at 'HD' resolution which looks no better than you'd expect from a DVD or worse. The only reason broadcast HD sometimes looks so good is because they dramatically reduced the resolution of SD channels at the same time in order to make room.
Amazon's 4K streaming bitrate is a pitiful 15Mbps FFS! Yet people are paying for it ...
Yes, they'll buy the TVs because it's "new" and it will look great in the showroom, but the picture quality of what they watch at home won't be any better and they won't care.