So much for 4K being the market leader in physical media.....
4K UHD discs market share is tiny and will stay like that for years if not forever
DVD discs even still outsells Blu-ray if you not aware and always has
Blu-ray will also continue to outsell UHD discs for years
Sales of physical media DVD/Blu-ray has dropped a lot compared to years ago as a lot of public now purchase digital versions instead or use streaming services to watch films and TV content
UHD Disc is unlikey to ever reach sales that DVD and Blu-ray discs achieved years ago as how most people now watch films and TV has changed
Most 4K Viewing is done from 4K TV's using built in apps or using streaming stick devices
4K TV's a lot been sold and will continue to get lot of sales but 4K viewing of content most is streaming or from digital purchases
If you not aware more revenue is made from digital purchases or renting and streaming subscription services than all of DVD/Blu-ray/UHD discs sales combined
This why like of Netflix/Amazon/HBO and other streaming providers now fund and produce films and TV and you will see lot more of this happen.
Digital purchases and Streaming overtook Physical Media DVD/Blu-ray a few years ago
The only physical media format that had increased sales compared to previous years is Vinyl Records