VITA has a great hardware -superior to its rival- and that can keep it on the market for many years... besides, will have full compatibility with PS4.
WiiU has an old hardware -inferior to its rivals- and that, luckily, will keep it on the market for two or three more years.
VITA will have more than 100 games this year, including big games like Soul Sacrifice, Dragon's Crown, YS: Memories of Celceta, Valhalla Knights 3, Killzone, Tearaway, both Final Fantasy X and A LOT of great indie games like Hotline Miami, Lone Survivor or Terraria. And, when PS4 come out, you'll can play most of the PS4 games on the Vita via remote play...
WiiU... what? a Monster Hunter... a Pikmin... and what else this year? And next one, with PS4 and Durango on the market?
Don't talk nonsense...