Take Bethesda, BioWare, Valve and Blizzard (And maybe some other great game making companies)
And have them all work on a super Elder Scrolls game.
Each company would be assigned to a certain thing to do to the game, such as Bethesda = Making the Giant Open World,
Valve for sheer awesome gameplay, BioWare for Story and voice-acting, and Blizzard for graphics or something.
And No Multiplayer (Since everyone apparently hates that some people want it. Stick to your own opinions please!)
But alas, such as this potentially the best RPG ever to be created will never happen.
But it is good to dream is it not?