You don't understand any of this at all. You have missed the point by such a wide margin that I'm not even going to bother entering a discussion with you about it. Here is a microscopic hint though: For how many years have PC monitors been much higher resolution than TV's? Here is an example: I have a 27" Apple display on my desk at work which is 109PPI, about double your HDTV, and I can still see pixels at the distance I use it at. The 8K resolution will allow gigantic future displays and cinemas to look the same as 1080p does now on your TV. If everything is filmed at 8K then everyone is going to need an 8K TV.
If you could go back 10-15 years in time, and meet up with the younger version of yourself, what would be his reaction to you telling him that you have a 60" screen at home?