Every once in awhile I find myself describing this concept to people. This presentation does a good job of it.
As GPU’s become more and more flexible, it’s expected that graphics APIs will go away. Flexibility in the rendering pipeline will be a benefit whether you are pursuing photo-realism or stylization.
Either way I’m excited to see what everyone comes up with next.

Mmmmm. http://www.quelsolaar.com/love/index.html