I'd say it wouldn't help much. You're building one small scene that's designed to be viewed from a relatively small area or path. I highly doubt they're building anything that doesn't appear on screen. If you were to walk about that scene in Unreal... I'd imagine it's the digital equivalent of a fake old west town.

That has to be a consideration. But I don't know how much it would really speed up production of a AAA Mandalorian game. Some... maybe a 6 month head start on a 4-5 year game.

It would definitely help make the game environments higher quality and be a cost saving to the studio.

It could be really cool to have in-game art using the exact same assets from the actual film. Even whole scene cinematography could be taken from scene data used in a movie.

I can imagine a consumer experience using high-end VR (say an attraction at Disneyland)... take the assets and cinematography from a scene in a movie, digitally recreate everything that WASN'T already digital from the scene, and then you could relive a scene in VR, with the bonus that you can navigate it in realtime and see it from different perspectives. This would be especially adaptable for franchises like Avatar where everything in the film is already composited in 3D.

On a darker note, you could combine all this with things like the Body Transfer Illusion, take some kinda psychedelic and star in your own horror flick where gruesome things are done to your own body in VR. Good times for the whole family!