Yeah, but this is how consumer electronics work. These are basically prototype models. Anyone remember when LEDs came out? They were in the $20,000 range, too. Now they're more affordable.
I'd say in about..hmm...5-ish years, we'll be seeing consumer level 4k stuff. It will be the next "revolution" in home video, requiring further upgrades. You'll need a new media player, a new TV, maybe a new receiver if they use a different transfer protocol other than HDMI. This is how they engineer forced obsolescence.
It'll be timed in a way that also makes more sense for the next generation of home media. The problem with 3D is that it came hot on the heels of the massive switchover to HDTV. That switchover was a godsend for the consumer electronics industry, because it came at exactly the same time that blu-ray was really taking off, so it meant across-the-board massive upgrades. But the problem is that it happened before 3D really hit, which meant everyone already HAD a new TV by the time the 3DTVs were coming out. Why would you upgrade just for 3D, ya know?
4K will be different, I'd bet. Not only is it timed better, but it also coincides with a lot of the remastering/blu-ray transfer efforts, much of which have been done in 4k anyway. The implication of that is that the studios can crank out 4K discs (or whatever the media format is by then) without having to spend boatloads remastering them. They're already at 4k. Or at least, that's my understanding.