Nintendo actually did something like that during the N64 era and worked out great for the gamer... no idea about the costs that went into supporting the development of games like Kobe Bryant's NBA Courtside, MLB featuring Ken Griffey Jr (which was probably cheaper because Nintendo owns the Seattle Mariners so they didn't have to pay as much to the MLB or Ken Griffey), Excitebike 64, various Rare games (Goldeneye, Banjo-Kazooie, etc.) and what ultimately became a GC game but Eternal Darkness. They had a lot of developers that produce a diverse set of games.
Not sure what happened during the GC to Wii era that made them shy away from the strategy outside of Japan because Nintendo's output in its home shores makes jokes out of what they put out in US. Europe seems lucky enough to have executives that while struggling aren't just letting the brand wither banking on the big name IPs but the US output in regards to consoles is well documented. But I can't believe it would be that expensive to set aside a budget and a medium to small team of developers to work on a few titles outside of their normal stock especially in the era of digital gaming where they don't even have to risk generating physical copies.
Nintendo really doesn't have to make new games in every genre and we can appreciate efforts like Lego City undercover and Wonderful 101 but the fact is the lack of games or advertising of the few games out there besides Nintendo Directs is hurting them more then the money they probably think they are saving.







