Drac is probably right. If you think about it, there's really not much overhead for Nintendo for this, especially for content. I'm sure based on its success, there will be an SNES Mini and an n64 Mini at some point. I highly doubt you'll ever see a storefront for it, because they can release a v2 with different games and goose you for the $60 again. And people will buy it.
I'm more surprised that they added a USB port, since it made it easy to hack it. It's a novelty, so why would you expect Nintendo to invest in it as if it were a 'new' system?