i think that's it. We used to use CD-Rs and DVD-Rs to record playlists and movies, respectively. Data hoarders today will prefer multi-hard drive servers over burning everything to Bluray, and for one-time file transfers, we have flash drives and online file shares. I just can't think of a use case for BR-R that isn't better served by a different technology.
fortunately, this change does not affect Bluray movies you can buy at the store. This is only about recordable Bluray drives, which basically no one uses on a consumer level.
So patents last 15-20 years... regular Blu-ray patent has already expired I guess, but Ultra HD Blu-ray is the current patent, releasing in 2015... so another 6 to 11 years before consumers can do whatever they want with the technology.
Would be outdated by then by the next new thing though.
That is if there is still an optical drive market in the future.
Sony never made a big deal of how the PS5 can play Ultra HD disks the way they did with DVD and Blu-ray. Ultra HD sales seem a lot smaller than previous renditions. You also have a lot of content being kept behind the streaming paywall rather than getting released.
I don't think there will be a large enough market to support 8K, backed up by the fact that a specification has been written but no one wants to go forward with making the disks and drives.