The radical changes in the work world, which are very real today, are going to require constant upgrades to our skills.
The 9-10-11 edition of The Economist had a series of articles on the changing work environment. One article in particular, My big fat career, discusses the changes already underway.
One particular author, Lynda Gratton from the London Business School, suggests you will need to acquire a new skill or expertise every few years. Continuous learning in other words.