I will keep my Kuro till 2020, 4k and HDR being was it is for now on top of immaturity of OLED.
I have a KRP 500 and a KRP 600 and so far its the pull of a larger screen that's making my wallet itch. I now have a 4k monitor and watching some 4k is making my wallet twitch even more.
The KURO's are just starting to look out of date now too.
Will probably end up keeping the KURO's and spendng the money on a 4k Projector