Personally I think a Super Mario Galaxy 3 would be way too much. Super Mario Galaxy 1 and 2 were good, sure, but I'd much rather see a great new idea than something reused over and over again. I love the theme of SMG, don't get me wrong, but I'd prefer not to see it over and over again. Nintendo was brilliant with the Mario series, and I know they can still make fantastic games, so why not put some of those other ideas to work and create something original instead of reusing their ideas? I wouldn't be overly displeased either way, but a newer game would be something that I'm sure we could all appreciate even more than old ideas.