There is nothing exciting about Nintendo's virtual console.
For a lot of people, there is.
For one, I like playing on my TV, with a controller meant to play whatever game it is I'm playing. Sure, I've played games on emulators on my PC, but using a keyboard or some random crappy gamepad never felt right.
And two, I don't want to have to jump through hoops to get a game to work. I just want it to work. My wife would NEVER figure out how to load up a ROM and play it. With this, she can simply turn on the Wii, point at the game, and start playing.
And three... like someone else said, this is actually legal.