A possible key would be to drop mildly-enhanced NES and original Game Boy games on mobile (enhancements including better in-game save structures, notably) and inject them with ads for other Nintendo products, making recommendations. (Like Legend of Zelda? buy A Link Between Worlds and Ocarina of Time 3D for your new 3DS!)
It would only work if it were incorporated as part of a larger strategy to upstream these gamers and in no way threatened the need to buy games on the consoles, though.
Monster Hunter: pissing me off since 2010.