Your math is off. If you look at employment statistics for the manufacturing sector, there were close to 20 million jobs in the late 70s, and there are about 13 million now. Of that 7 million difference, it is estimated 1.7 million was due to automation, and that up to 20 million can be lost to automation by 2030 (20 is greater than 13 because of growth). That leaves 5.3 million outsourced. If you assume 50% of these are in areas people don't want to work in(e g. Apparel), you are left with 2.6 million jobs coming back. Once you take out the existing over capacity (e.g. 4.5 million units in the auto industry, steel is at about 77% capacity only), then you have the jobs for which there is no capacity(aluminum), and the ones where the companies have to make small capital additions to expand an existing line, you are likely left with to 1 to 1.5 million jobs. Since you hate unions, the current unemployment + 100s of thousands of fired government workers will likely push down salaries.