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First reaction is that this would work well with ideal students and struggle (probably fail) with real world students. I principally say this not because the general idea is invalid (many online education and digital cognitive tutors are looking in a similar direction) it's just that young people are not good at self motivating when things are difficult (or when they have a more attractive alternative). Those super self directed learners will succeed no matter what, and this sort of program would probably work fine. The vast majority of students (even "good" students) do not fall in this bin. Your untrained hourly teachers may be able to provide such motivation, but there is significant value in the kind of relationships an experienced instructor can create over time with immature/reluctant/distractible/traumatized/hungry/sleepy/angry students.