Not technology, not software, not any bells and whistles – it's what it's has always been and always will be in education – motivation!
From Walter Frick … Cracking the Biggest Barrier in Online Education: Motivation:
Having tried both Coursera and Udacity, I can attest to the quality of the content and the format. Put another way, technology is no longer the primary barrier to the success of massive free online courses. It’s not even accreditation, though that’s a big one. The biggest barrier is motivation.