With what bandwidth though?

Top of the line graphic cards still cannot max out the latest games at 4k60, how can they achieve 8k?

Top graphic cards will always be catching up to the latest games. Software is developing much much quicker than hardware.

Resolutions higher than fullHD are useful not only for TV in front of your sofa. You need 8k (and even higher) to VR-helmets. Also there already are cinemas with giant displays instead of projectors. Don’t be a retrograde.