No, they shouldn't make Galaxy 3. If the next game is called Universe, it shouldn't just be another space-themed Mario game. It should take the entire Mario universe from the original Super Mario Bros. (or even Donkey Kong) to Super Mario 3D Land and make a whole game filled with throwbacks and parodies of older games with retro-themed levels. The gameplay should be its own thing but the levels should be made to look like past games, think along the lines of The Realm of Memories in Four Swords Anniversary but the entire game is like that and it's not just used for aesthetics. They could have a lot of fun with that concept. The game would probably have to be 2D instead of 3D... or maybe both.