I wouldn't say Bluetooth is a gimmick for laptops - I transfer a lot of stuff from my PC to my phone, and while USB cables is more stable, it's ultimately more of a pain to receive a phone call (for example) while the PC is sending data.
Wireless is being pushed quite heavily here in London, so much to the point where they are springing up all over the place (often for free), and Bluetooth is being used as an advertising platform on the Underground network. Even though, as Jim says, it's just for the positioning devices, if Bluetooth was enabled for broader use, it could (for example) form the basis of a "Nintendo Hunt" where clues are left in games and at the location specified data is sent via Bluetooth to your phone/device and then possibly sent "back" to the game to unlock things.
That is an incredibly exaggerated idea, and I'd expect either Bill or Ian to shoot it down, but Bluetooth IMO can allow Nintendo to take the game from beyond the TV screen, and potentially give for more devices for the Rev to interact with.