1 - The prices have come down. Even if you are not a videophile, and even if your budget is less than $1000, there are plenty of options.
2 - Netflix and Youtube have already started streaming a selection of 4K (Caveat - Cable TV isn't 4K yet)
3 - The new 4K TVs have streaming devices for Netflix built-in
4 - PlayStation and X-box already output 4K
5 - 4K is the new standard for movie production
With incredible picture quality, all the acronyms like 4K, HDR, and OLED, the insanely thin borders around the screen, and new super sizes like 65", it is worthwhile to consider moving up.