Blogging may not be the most glamorous job, it certainly doesn't pay the most, and it's not exactly a public service. It's also rather thankless, and the hours are so-so. But Mario would get to do it from home (if he can get wi-fi in the Mushroom Kingdom, that is).
How does Mario starting a Tumblr make for an engaging video game? Hell, if Alan Wake can turn writer's block into a horror game, Nintendo ought to be able to do something with Mario sitting on his ass all day surfing Reddit.