Nintendo should bring back their seal of quality.
There. I said it.
Miyamoto: "You wanna use our system to make cash for use on other systems? Fine. Make it worth our while."
Don't make it super-strict like it used to be (that's what cost them the market-leader position in the first place), but for god's sake don't let crap like Imagine: Man-Eating Sharkz on your system.