200 years ago 95+% of all people worked in agriculture. In developed countries, now barely 1-2% do so. 100 years ago the vast majority worked in manual labour jobs. Now people are moving on to service jobs. Macro-economically speaking, those were much larger and more rapid changes than what we're seeing right now.
This is not new. It's normal economic development. Nothing unusual at all. People have to stop portraying this negatively, and Marc is correct in seeing this as a positive to humanity.
His argument is that we need to manage this shift as a society. Some countries pro-actively do so (European social security comes to mind), others do not (USA). I tend to agree with him that it does need to be managed.