It must just be your area Bill. Here in the DC area, the construction industry has been going strong for many years (even through the recession of the mid 2000's). AutoCad courses fill up quickly in this area and many young folks are still getting in the trades. I don't know much about the machinist trades, but there are two small shops in the same industrial park I am in.
Obviously, mechanical drafting has, for the most part, been replaced with computer aided drawing. Tools of the trade have changed, but the basic concept is still there.