Scott keeps getting questions about when to buy a new Ultra High Definition TV, and he says it's all in the timing. Unless you're an early adopter that has money to burn on a new TV every year or two, the timing just isn't right to get a 4K TV. Sure, prices have dropped, but there isn't a standard that is wide spread just yet. Plus, with four times the resolution, you either have to get a screen that is over 70" or you have to sit up to half as close. Otherwise, you lose the benefit of the additional resolution and you may as well own an HDTV.
And ironically, plasma would still be the best option for 4K, but sadly, nobody makes them anymore. LCD's marketing juggernaut, and the fact that LCDs are brighter on the showroom floor got users to choose the LCD over Plasma. OLED is an option, but it isn't cheap. Then there's a lack of content still, unless you're a Netflix subscriber. So Scott advises to keep waiting. It'll come soon enough.