It's a constant game of changing expectations designed to take our cash.
Well, yes. That's how technology progresses. Paramount isn't in it for the "art" of television.
We changed our own expectations in HD. We saw it. Old CRT sets weren't good enough anymore and we upgraded.
A few years ago they tried 3D. It didn't work out so well. So the industry stopped promoting it.
Now they're trying 4K. If it works then it will replace HD. If it doesn't then it'll be like 3D.
I'm waiting for 4D, time dilation and compression, so you can insta-view a whole boxset of episodes in the space of a few seconds (Inner Light style), or stretch out your favourite, favourite movie so it lasts for days!