'Shovelware' is thrown around too easily, and is subject to interpretation. I will say this, the shovelware of today, ain't nothing like the crap we saw on the Atari. You literally (And I do mean literally) had the same exact game, with a different sprite, and a under a different name. And while Wii has more than it's fair share of 'lazy' games, I wouldn't call them all shovelware.
With that said, Nintendo can't really dictate what third parties do. The last time they did that, developers jumped ship. Besides, unlike the NES era, there are plenty of other consoles in town. Soon to have their own motion control. So no, Nintendo shouldn't pass judgment over third party games. They should only focus on the quality of their games, establish open communication with third parties (But not try to control them) and count the royalty checks as they come in.