it would be an expensive endeavor but that would be the least of my concerns if this would be a movie.

So true but can you imagine the cost to create a Fallout feel that would be long enough to convey the world. This is not Star Wars when you throw a few fights explain absolutely nothing of the universe and its rules. I could not imagine making a movie that did not flop. It would need to be gritty, a feeling of desolation, and horror with death waiting at every turn and without dumb jump scare. Yet be of a caliber of Avatar when it comes to the scope of its diversity and lore and the “long wanderer” not been some super soldier but just a guy doing everything in his power to just stay alive. That would be incredible but so hard to make. Doom movie was so bad I never watched it a second time, yet the games where the best for their time. Same for the Quake franchise.