15% of US Households to Have 4k TVs By The End of the Year According to Sony

[SvennoJ]

4K tvs are still 50% more expensive here than their equivalent 1080p size, and that doesn't get you the full benefit of HDR, just the resolution boost. Buy a cheap 4k tv now and you have the equivalent of a 720p panel in 2006.
Plus tv here is still 7-8 mbps mpeg2 720p/1080i, with 1 experimental 4k channel (for some sports broadcasts) Streaming is the better option, yet in a household with everyone using the internet you'll need a lot more bandwidth to get stable 4K or tell the other people to stay off the internet :)

If you can, wait for UHD premium sets to come down in price. Those are still not full HDR capable (rated at >= 90% of DCI-P3) yet the new 4K blu-ray standard aims for those specs. HDR will make the real difference in the beginning as games can more easily output 10 bit color (HDR rendering is already a decade old) than render in native 4K. Upscaled to 4K with HDR output will happen before native 4K.