I'm going to be overly pessimistic and say the following quite bluntly, "Nothing".
In order to save off pure disaster, Nintendo needs a sharp price drop ($200 range for the Deluxe), a massive influx of must-have software titles, a console firmware updates that remove most of the complete horribleness that is their current dashboard, and updates to their online experience that actually provides something that is on-par with PSN. Preferably they would also have to make their Wuublet not completely suck for battery life.