I went into a Gamestop and played the Super Street Fighter IV 3d demo on one of their store display units. This got me thinking, is it possible to download this demo to a regular 3ds?

What exactly happens to the demo cartridge after it completes its run? Are they sent back to Nintendo and destroyed?

I know the regular SSFIV3D game uses the download and play option from what I've read online. My co-worker thinks it is erased when the system is powered down, is this true?