Assuming copyright laws don't change by then, otherwise there is no way to know.
A plausible answer is 1977 (when the film was released as Star Wars) + 95 years (for pre-1978 works) = after 2072. However, the film had been edited by George Lucas for the 1997 "Special Edition" release. Does this mean that I cannot publicly play the Special Edition VHS tape I have at home in 2073 and have to wait until 2093, or perhaps 70 years after GL's death?
George Lucas has been infamously attempting to erase copies of the original movie. Therefore, no HD home video release for the 1977 film exists, however, a fan effort known as the "Despecialized Edition" compiled different versions of the movie from various sources, patching the Special Edition 4K Blu-ray rip to try to replicate the original 1977 experience. Does this legally questionable version enter public domain in 2072, or does this only apply to official (SD) releases?
Anyway, the Despecialized Edition project as well as George Lucas's treatment of the originals is an interesting rabbit hole to delve into for any movie nerd.
Because I manually download videos to watch on the bus or train (thanks Grayjay & NewPipe), most of my subscriptions are for long-form, often listenable content:
Retro Tech: Techmoan, Technology Connections, Posy, Janus Cycle, CRD, Ben Eater, DiodeGoneWild, pannenkoek2012, videolabguy, Adrian's Digital Basement,The Science Elf, previously LGR and 8-Bit Guy/Keys
Science: Kuvina Saydaki, BobbyBroccoli, Numberphile, Computerphile, carykh
Tech News & Discussion (not always long-form): Louis Rossmann, Mental Outlaw, Brodie Robertson, SomeOrdinaryGamers, Asianometry, Atomic Shrimp, previously Thunderf00t
Urbanism: Not Just Bikes, Adam Something, Alan Fisher, Tramly, BritMonkey
D&D Story Narration: CritCrab, Puffin Forest
Bold channels are most underrated imo