The Force Unleashed 3 should be a thing, but made by Platinum. They can keep the awesome physics used for force powers, but P* would finally give the series some high caliber action combat mechanics. MGR's slicing translated to a lightsaber is painfully obvious, and even more painful knowing that Disney and EA's bullshit will prevent that from ever existing.
Disney is a company that's always in the mood to make a shitload of money. If they wanted to do it, they'd make TFU3 a Platinum game, or spend a fucklety-bajillion dollars in replicating MGR.