Hard paywall.
Was not able to read the full article in full, but title is an interesting question.
High wages in blue collar fields will be a thing of the past in an world where automation will thrust massive amounts of people whose jobs were automated onto the unemployment line. These people will have to make a choice :Either get re-educated or do simple blue collar jobs.
The good thing is the price per hour for plumbing and other Blue Collar jobs will be a lot cheaper than it is now because of an increase in Labor Supply.
Again I could be totally wrong, but as of today that is the direction we're headed.
Much of the article seems to hinge on the dollar's decline in value, this may be down to Mr Trump being president.
Similarly with the UK's decline in the value of the pound after Brexit making it superficially more competitive.
Dare I say it, devaluation is overvalued.