In All honesty, I don't think another game should be made. They can continue making movies. Whether it be stand-alone films, or movies of the games.
Personally I think Movies of the Games is a bad idea unless they choose Strangers wrath. With AO and AE, you've got to fill at least 90 minutes, and try desperately to avoid 70 minutes of "Hello, Follow me" crap. You owuld end up adding in new parts of the story, which would greatly disappoint fans because it could be seen as doing a George Lucas to an already good story.
Strangers Wrath is the film that I think could be done without adding much new plot to the film. Maybe have An outlaw at the beggining, a second outlaw, then Caste D. Radier then the whole section of the film with him as the Steef. Stranger is the most suited for a movie IMO.
Edit:
I made that image some time ago but I just added to Oddline Wordart onto it now.