Honestly your post is pure brilliant, a version of Dune on a MMOFPS would blow the doors off the gaming industry. Unfortunately sadly enough none of the gamemakers want to try it, no profit.
1992 to 2001, only 5 licensed Dune video games have been produced. All of them blew junks... and I do mean all of them. They were strategy games. No firm FPS shooter. Cryo tried to pull off “Dune Generations” in 2001 but went bankrupt and canceled the project. Quiet ever since.