I think we are about due for a good Terminator game and since Bethesda made the brilliant Skynet, they should make another one. It would probably be a lot like Fallout 3 only set in the Terminator universe. I would want less RPG elements and maybe more shooter elements (more like STALKER and Fallout, I guess). You would have a home base that you defend Tower Defense style and you would have to go out into the wasteland to scavenge for spare parts to build your defenses. You would also have to find people and recruit them to join your cause and what not.
Okay so maybe Bethesda is not the prime developer for this but I think the game should be made at any rate. There has not been a good Terminator game since the 90's.