Obsolete is a strong word. What happens in these industries is that they get split into the high-end (organic farming, small order manufacturing) and the mass-production low-end. Yes in many ways margin have fallen but overall production has gone up, way up.

That being said - retail seems to be our generation's victim. In the last decade, we've replaced media consumables with digital equivalents. This alone has mostly killed music, book, and movie rental stores. It's not just retail stores but retail services - tax prep, insurance, and financial services. Some of this took place in the 90's, but it continued in the 00's and it will continue in the 10's.