There are many learners who would benefit greatly from more accessible design than there are learners who are in the categories covered by legal provisions involving learner accessibility.
Who decides when the learning is completed? What does that even mean? Does it even matter?
One important lesson we can take from games is the need to have an ebb and flow to the level of difficulty we put in front of our learners. If it's all uphill, that's a recipe for burnout.
Help your learners to buy into your course by offering them ways of gaining a feeling of ownership and personalization. We put more value into things that we help to create or that we customize.
Motivation can be viewed from many angles. Today we look at locus of control and how motivation changes over time.