From 1912, we can easily predict a massive change in the job force for 2012 and beyond.
The Industrial Age created factory jobs for those servants and their children. Today manufacturing jobs are disappearing, retail jobs will drop, car related jobs will disappear. What will they do? What did the servants do? There's your answer.
But what we know is that new jobs in the Knowledge Economy will be created. And the factory worker's children and grandchildren will be just fine, just like you are fine as the great grandchild of a servant.