3DS doesn't need an upgrade. PS Vita should. 3DS as handheld dominates not just in Japan but internationally.
Wii U on the other hand, I believe Nintendo is going to either develop a new console for this Gen or upgrade Wii U. On Game Theory: Wii U is the new Virtual Boy, Nintendo mentioned that if they flop, their going to make a new one immediately. Like what happen to Virtual Boy. After it flopped, they developed Nintendo 64 immediately.
And really, they still have a lot of money left. Like about Y600,000,000,000. And if they continue to flop through the years, they would be dead around 2050. So, I hope they don't waste this opportunity.
EDIT: OF COURSE, to maintain/increase 3DS's lead is to make good games. For the Wii U, the alternative way to increase their sales is to make more good games. Another way is a price cut.
Top 5 Games of 2013:
1. Grand Theft Auto V - 9/10
2. The Last of Us - 9/10
3. BioShock Infinite - 9/10
4. Animal Crossing: New Leaf - 9/10
5. Injustice: Gods Among Us - 8/10
Top 5 Flopped Games of 2013:
1. Aliens: Colonial Marines - 4/10
2. Call of Duty: Ghosts - 7/10
3. Dead Island: Riptide - 7/10
4. Kingdom Hearts HD 1.5 ReMIX- 7/10
5. Dead Space 3 - 7/10
~God of War: Ascension ALMOST Made it to the list.
