The one franchise Nintendo NEEDS

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Nautilus said:
If that happens, it may take awhile for they start developing it, since Camelot is busy making the new Mario Tennis(correct me if im wrong).But i do agree with you, Nintendo needs to bring it back.And having Isaac in Smash would be a great marketing for the series, to make more people aware of the franchise.

I'm pretty sure Camelot is making the Mario Tennis. 

It's sad that Nintendo puts one of their best studios qualified to make RPG games with intense and good stories into making Mario Sport games.