Another thing to consider is that the camera manufacturers are already adding 4K to their movie functions both on dedicated movie cameras as well as on still cameras. So the push to replace equipment to handle 4K will come from many directions. Blu Ray disks of commercial Hollywood films, home movies, still cameras slide shows, internet providers, TV shows, TV manufacturers, etc.
I suppose it's called "progress". Hey. You don't want to fall behind the times. Anyway, you really didn't need that extra money , did ya? And then when you finally get all your equipment updated to 4K, they'll release 8K.