I've forgotten about the Wii Vitality Sensor and after looking it up, there's still a chance it may still be released. If so, I wonder how many games could possibly use that peripheral, Wii or Wii U. Maybe a lie detecting game? Maybe a horror game just to see how high your pulse races?
We didn't buy the PS3 when it was brand new, but we did when it was dropped to a much more reasonable price. I bought the 3DS pre-price drop and sometimes regret that choice. For something that is essentially a console-addon / controller / small screen, the price is a bit too much. At the very least, we'll wait for a price drop, at the most we'll wait for more games to warrant the purchase.
Also, on the topic of the Wii-Vitality thing? I remember seeing a comic of OoT-style Older Zelda smiling at the audience and thanking Link, but then pausing and jerking away from him in disgust. "But I can see past your guise and see your true self. You are unhealthy, player! You should play WiiFit!" and the next panel shows a 'butterball' Link-cosplayer with the sensor on one of his fingers.