Get the D&D license. Put everything in the latest books into the game. Player with screen controller is the Dungeon Master - he can use pre-made campaigns/scenarios, create his own using a powerful editor, or browse/trade for ones online. Dungeon master uses the console to crunch all numbers, etc., while he controls action and tells story. Players have ability to do everything described in books, plus the DM has the ability to modify all numbers on the fly so that anything players can imagine on the fly is also possible. Players use remotes to input actions. Remote shows turn based combat unfold, or travelling around, or making a fire, or whatever.
Also make it fully moddable, so that the base fantasy game stocked with fantasy monsters from the lastest monster manual can be turned into a space sci-fi game, a 19th century western, or whatever.
Print money.
Also, for a baseball game, have the screen display scouting reports on pitchers/batters, as well as any other relevant stats. Of course the usefulness of this scouting report would depend on how good your scouting team is, etc.