99% of consumers are clueless.4K TVs are everywhere in the USA; many computer and even the latest smartphone displays are greater than HD (revealing the resolution limitations of HD footage); and most video work is shot in 4K even when finishing in HD, to make use of the greater resolution to reframe and to enhance quality; also, many pros and prosumers need and want a hybrid camera that does stills and video; and, to top it off, many corporate productions are shot on Sony FS7s and the matching A7 series is used for a ton of gimbal work. All this goes without mentioning any future proofing benefits of shooting in 4K.
So, really who's clueless here?
To get good 4K requires skill beyond just having the camera.
A home movie of your vacation to the Poconos etc. would bore me to death even in 16K.
There is so much more than the number and you don't seem to understand that concept. A 4K TV with a professionally done 4K program is likely very nice, but your home movie is far from that quality no matter how good your TV is it can't fix poor imagery, you just might get possibly sharper looking crap.