Unless another brilliant technology comes along that kicks the 4k TV back, everyone will buy it.
And wanna know why? Because it says 4K, many people with enough financial possibilities will just buy it, not really knowing the difference from 4K to 1080p.
Adding more pixels and size was always the standard for Televisions, and every once in a while someone brings up a new technology that changes the game. An example would be the LED TV screens, just kicked back the old LCD's and plasmas we had at the time.