Technology for the home is limited not only by pure science but by public demand: How much will they spend and how much do they care. "If a man...can make better chairs or knives, crucibles or church organs, than anybody else, you will find a broad hard-beaten road to his house." --Ralph Waldo Emerson. Build a better TV or projector, a better player, a better broadcast system, and price all of it so it's easily affordable to everyone, and it will sell.
Right now, though, even high definition is a hard sell for some people because it means shelling out too much money. HD will (has) become a default among TV's only because that's almost the only thing you can buy anymore except for the tiniest of home screens. 3-D fell on its face because people don't want to spend an arm and a leg for new equipment they don't perceive as worth it. So, simply launching a 4K system is one thing; selling it is another. Give the current technology another five-to-ten years, and we'll talk about it.