The U.S. wine industry has been on an historic 50-year run. Demand from Baby Boomers drove the effort. Now the wine industry is fearful the run is done and tough choices loom. In the 1970s there were about 1,000 wineries in the United States. Today, there are more than 11,500. Napa has gone from 25 wineries in 1975 to more than 400 today. Wineries and grape growers planted more and more acres t...