More services need to placed on 3DS regarding video on demand. When this happens TVii connected to the 3DS is a big deal. Temporarily stream or even download a favorite show and bring it with you. Heck partner up with Hulu Plus, Amazon, Netflix, and Cable providers to show 3D versions of movies, shows and professional sports. It one of the few price easy avenues to watch 3D. Lets say you rent The Avengers on Amazon through your Wii U, it is on your account that you rented the movie so when you boot up Amazon Instant Video on your 3DS it lets you play the same movie but the in 3D.
More potential that I doubt Nintendo will push for, but fans would love.