I think the parent point was that there is currently insufficient bandwidth to even make 576p look good for many channels. Given even a high bandwidth slot, 4K

I think the parent point was that there is currently insufficient bandwidth to even make 576p look good for many channels. Given even a high bandwidth slot, 4K with low compression might look better than 8K with high compression. Specifying just "8K", is no guarantee of a quality picture.