It’s part of the plan, not the backup plan.
With the the sales of the Wii U not up to par, Nintendo confirmed plans on developing content for mobile phones. Although not confirmed officially, the so-called experts are expecting this to being a step into making cell phone games. Nintendo insists that it is just to promote the current Nintendo platforms (Wii U and 3DS), not to make phone mobile games. Whatever mobile content Nintendo chooses to put out will certainly make them smarter.