> I used a 30hz 4k tv as a monitor back in the day

I used that exact same monitor!

I'm hopeful, but I'm a little less sanguine than you.

A big part of the reason why 4k got so popular is because there was so much 4k content available. And because it was easy to see how much better 4k looks than 1080p.

Neither is true of 8k.