When has learning ever NOT been blended?
The "stickiest" learning occurs when the attention of the learner is directed repeatedly, over time, and via many media toward the desired learning outcome.
The best teachers figure out how to bombard the learner with that cacophony, in invitational and engaging ways (NOT through threat, coercion, and compliance).
After all, both learner and learning task creator are continually in the process of LEARNING. Another way to think of blended learning, maybe?
No end in sight.