The Skills Transformation and Modern Work

Anand Agarwal, the CEO of edX, has written a good article (from last September, but still topical) on the uptick in change regarding in-demand job skills, and the difficulty for traditional education in keeping up. 

How does a person keep up with an accelerating pace of change? Should we retrain every four years? Mr. Agarwal's article (available here) has some good insights.