My older brother falls into this category. Alot of people fall into this category. We get excited for new games, and we love to see them in action, but alot of times we don't like to play. We just want to spectate.
Here's how spectator mode would work in Mario Kart 8.
A couple people grab some wii motes and nunchucks to play mario kart 8 and do some battling or racing. The spectator grabs the tablet. He gets to press a button and select someone to watch as they race. He can move the tablet around the player (similar to the way the zelda in nintendo land uses the tablet) to see all around the player that is racing. He can push a button again to switch to another player and spectate that person.
This would actually really get the spectator immersed in the game without having to actually play. And give the spectator a chance to enjoy the beautiful graphics and look at all the small details around the course instead of having to concentrate on the race.
