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Sure this can be abused, just like rounded edges and drop shadows can be abused.

There are already some very attractive implementations: https://www.spotify.com/us/

That page plays fine on mobile, sans parallax, too.

Spotify's implementation is actually very clever; they've accomplished it in a way that doesn't involve repositioning background images like nearly every other library out there. They also stick to native functions as much as they can to reduce computational overhead (replace calls to cssText with jQuery's css() function for example, and performance drops dramatically). That said, it only works on devices with CSS transformations, and poorly in IE9 (which is why it is disabled on IE).

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