Watch the newest gameplay trailer for Gollum: The Untold Story shown off at Nacon Connect 2022. The Lord of the Rings: Gollum is a narrative-focused adventure game that centers on J.R.R. Tolkien's famous tricksy, dual-personality character in events that occur between Gollum's finding of the One Ring and the start of The Lord of the Rings story. Gollum is set to release on September 1, 2022 on PlayStation, Xbox, Nintendo Switch, and PC.
Fantasy is nice, but Willow was a fail. It's probably because I've already seen and read Gollum's arc and don't need to see it revisited yet again. I'd rather see something different. How about Morgoth's story (although I'm being a bit devilish there because Morgoth's story is essentially the entirety of The Silmarillion).
To be fair you can't really fit The Silmarillion into one movie. It's huge. Put it this way, the entire LOTR trilogy is only a small section of the Silmarillion, and even the Peter Jackson movies didn't adapt a lot of it (including the return of Saruman where he goes to war with the Shire after the Ring gets destroyed and the Hobbits return home to his rule over the Shire).
It covers a large span of time starting from the creation of the actual universe (which is essentially just showing Morgoth's origin). There are books that have been turned into stories taken from The Silmarillion and expanded on, such as Children of Hurin, Fall of Gondolin and Beren & Luthien being examples.
The overarcing story that remains prominent throughout the story is the hidden presence of Morgoth and The Silmarillion only comes to a close once he is defeated (he is effectively banished and dispersed into Outer Space but it doesn't imply his outright death). Granted I only read the first edition hardback (which is apparently worth around £300 so I'll be keeping hold of my copy) and it's possible that amendments to the text were made in subsequent reprints.
So it would take a current MCU amount of movies/shows to cover most (but probably not all) of The Silmarillion. That and the Tolkien estate are apparently very picky with who they lend the rights to, or so I've heard.