I actually really like Anki (and think it's a great tool!) but this is one of the biggest problems I see for spaced repetition to get in the hands of more peopl

I actually really like Anki (and think it's a great tool!) but this is one of the biggest problems I see for spaced repetition to get in the hands of more people. You can change the number of review items but it doesn't change the fact that you have an impossible backlog to get through. Then people just get bored and churn.