At this point, outside of a lower price, much better marketing and Smash Brothers following up Kart 8 quite quickly, I can't see where Nintendo are going to get major hardware boosts outside of the Christmas season. Even then, baseline sales are so low that Christmas sales aren't going to be particularly impressive.
I don't think DKTF debuting like this in Japan was unexpected, nor do I think it's reason to hit the panic. Nintendo have already announced a long-term shift in the direction of their games business, and the establishment of a new business. They obviously have already reacted to Wii U's failure. People need to accept that Nintendo's solution isn't going to change the here and now, but is instead aimed at long-term stability and independence.
I wish they'd do more for Wii U, but if they throw more and more into a loss-leading enterprise, then how are they going to negotiate a long term change of direction? My plan is to sit back and enjoy my Wii U.