Assuming you're sitting 10" away from your TV (common benchmark), you would need a 280" display to see the difference between 8K and 4K. In the living room, that rules out physical displays (price) and pretty much limits it to projectors. However, the most popular projector screen sizes max out at 120" (3m).
I just don't see 8K making any inroads into the living room, unless it becomes cheaper to make than 4K displays (scale). However, you would not be able to tell the difference, so the consumer benefit just isn't there.
The one place where this does make sense are large public displays.
They said they were surprised at the number of encoder tools they could make use of in AV1 for live video and that it's all about making smart choices in your encoder for your particular use case.
Live streaming games at 4Kp60 with AV1 can be done at 6 to 10 Mbps:
I just don't see 8K making any inroads into the living room, unless it becomes cheaper to make than 4K displays (scale). However, you would not be able to tell the difference, so the consumer benefit just isn't there.
The one place where this does make sense are large public displays.