But ultimately 4K does so much more than 3D, and is so much more useful to the average person, that it won't wind up being an unused feature the way 3D is. Once Netflix is streaming UHD, that's what people with UHDTVs will watch be default.
As for the price cuts—Seiki and TCL both showed that UHD/4K itself is not expensive to produce, the real trick is building a quality LED-based LCD TV. However the prices on the Seiki and TCL units were low enough to create price pressure on the big guys.
Netflix can't even stream 1080p without compression problems up the yin-yang, so I find their UHD claims dubious at best. These Seiki units are junk. You get an overall better calibrated picture on a budget 1080p flat panel. Pixel count is not the only requirement for excellent image quality. I doubt the big guys are even batting an eye at these knockoff Chinese wannabes.