Re: So broadcast is the way to go for 4k media?
I reckon 'not bothering' is more the way to go. I fail to see in what way 1080p is not sufficient, given that the vast majority of humans have imperfect eyesight anyway, and given that most of the stuff broadcast is utter tripe and would be better off in lower resolution, and on mute.
This is just another case of 'status symbol' chasing. Given that the only 'real' use for this that I can think of is watching a film on a big screen in higher resolution, why not just go and watch it at the cinema instead, and save yourself the hundreds of pounds? It's not like that will cost significantly more than streaming the thing, and you don't have to turn your wall into a 1984-style viewscreen.