It looks like after having acquired half the movies in the world, Disney is holding them hostage for any future release on home media. A physical 4K release, the current format on UHD, will never be a thing for many films.
That means many films, like True Lies, Aliens, The French Connection, classic James Bond will not see a 4K/UHD release.
Whilst you may shrug and be satisfied with a 4K stream, a physical UHD copy would mop the floor with 4K on demand. The recent requirement for more bandwidth and meant Netflix has decreased the quality of their stream and 1080p alongside 4K content has looked like a dodgy pirate copy.