Nintendo is actually smart. They aren't being like Activision and killing off popular franchises in a single generation by releasing one game per year. I think it's one reason why their franchises have survived for so long. Also, I remember once reading an old interview from the late 1990's where Shigeru Miyamoto was asked why Zelda: Ocarina of Time was getting a sequel but not Star Fox 64. His response was that his team did everything they wanted to do with Star Fox 64 and couldn't think of any way to make a better game at the time. With Zelda, there were many things the team wanted to do with Ocarina that they didn't get to do yet, that and he loved the game engine developed for Ocarina.
That's really what Super Mario Galaxy 2 is if you think about it. It's everything that they didn't get to do with the first game. It may seem like a crappy business strategy to some, but it's good to see that somebody out there still cares about their IP's.
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