I think there is potential here. As I mentioned above, Anki has a few quirks that make it cumbersome to use on occasion. My top three complaints, accompanied by potential solutions, would be as follows:

01. Getting information into Anki. You've already got this covered pretty well. The ability to clip notes from around the web or add them via other methods is wonderful. Think of a tool like Evernote or Clip.to

02. Poor Quality Decks. Let's face it, finding a good pre-made deck in Anki can be a challenge. You can easily solve this, simply offer your users a variety of high quality decks. The better the quality of the decks, the more value. It can take a REALLY long time to make a good deck, I'd gladly pay a modest fee for a well made deck that saves me hours of prep time.

03. Bad Design & UI. I love Anki, but she isn't the prettiest girl in the room and she isn't always easy to get along with. A little bit of elegant design and thoughtful UI would go a looong way in boosting the perceived value of your product.