I have a reason to not go down that road - I have a solid enough Anki habit as it is, and don't need extra push. Anki doesn't feel like a chore.
There are plenty of people who do have a solid habit and then lose the habit after something comes up in their lives.
I put a weekly goal of review cards into Beeminder so it will only start pushing when necessary and not cause troubly otherwise.
If it's worth saying but not worth its own thread even in discussion it goes here.