Indeed, Common Core and competency-based learning should be a natural fit, as the former creates learning maps for students to master that can shift the emphasis from time to masteryof deeper learning.
Although we have a few models that have been able to personalize learning and do a better job of instituting mastery-based learning for students, no one has figured out how to do it at scale per se yet, and there is still plenty of room for growth in student outcomes.