I agree, what if people decide not to learn. My two answers are 1) they wouldn't learn in a compulsory model anyway, not really (https://medium.com/@prendalearn/teaching-is-impossible-what-... and 2) gamification can go a long way.

Actually testing this next week with a summer camp where we bought a bunch of cool, fun toys and the kids can play all day once they get their work done (x% mastered on Khan Academy, y pages read, z words written). I'm making all this up - no academic background.