Yes, I work in engineering. And this isn't about being completely replaced (although that may come someday). It's about efficiency. A engineer using modern tools almost never has to break out the pencil and paper to calculate anything. Even the calculator is quaint and old school in many applications. Modern Engineering is so much less time consuming than it used to be. As is drafting, accounting, purchasing and any number of other fields where companies are cutting back. They will never go away, but the number of people needed to do the same amount of work is going down and has been for many decades.
On top of this your assertion that every laborer who used to work the floor of an assembly line should run out and go to college or trade school is a bit far fetched. First, they won't. And second, many can't whether because they aren't capable, or they don't have the money. And even if they did, the notion that our economy would be helped by such a massive shift is also problematic. We don't need 200 million college educated people in this country. The market for those with a degree would simply become saturated (just look at India for an example of a saturated market of college educated people). We are already seeing that in certain fields where an associates degree, which used to be more than adequate and still is to do the job, is now not sufficient to get the job.
I'm not the only one who has had similar thoughts.
http://www.forbes.com/sites/johntamny/2011/04/16/india-and-the-economic-folly-of-a-college-degree/
http://www.wsj.com/articles/SB10001424052748703515504576142092863219826
http://www.economist.com/news/unite...-return-higher-education-would-be-much-better
I'm not saying engineering isn't a worthwhile field to go into. I would say the opposite in fact. There is a shortage right now. But if even half the people working at minimum wage jobs went back to school and came out packing degrees, I suspect two things would happen. The value of a degree would fall precipitously and the quality of those degrees would suffer.