Nicholas, that's a good ad!
Seriously all they have to do is make an ad focused on that golf scene:
No music. The GamePad on the floor, a ball in the sand. She walks up to it. Swings her remote. Pan up to the TV and there's your ball, flying off into the distance. Cut to logo: Wii U. Fifteen seconds. A million sold.
I was at the E3 2011 conference and that scene got the most audible reaction by far. I hope it still exists as a viable play mechanic, though; I'm worried they tried and the Wii remote-to-GamePad interaction just wasn't right. Our imaginations ran away with the original Wii's potential, and much of it stayed a fantasy. Hopefully Actual Wii U is closer to the truth of what we all imagine it can become.