Fastest Dying Jobs

Jordan Weissmann:

In roughly 20 years, entire categories of factory work nearly disappeared. If your job hinged on your aptitude with a shoe machine, it was in danger. Likewise if you worked a lathe every day for a living, or had a spot anywhere else on a classic production line, where dozens of hands handled simple, discreet tasks. (How sociologists ended up on this list, I'm frankly not sure.) These were jobs that, thanks to their heavy levels of unionization, paid a good middle class wage to employees without many skills. And when manufacturing technology improved, they became redundant.
Of the fastest-growing occupations, the winner, by a long shot, was numerical control machine operators -- the men and women who program and run factory machinery. Specialized knowledge replaced a steady hand and strong back. But nearly all of the other fast-expanding job categories required even higher levels of education, and few had high union membership.

I understand the drilling and boring machine operators, lathe operators and milling machine operators declining while numerical control machine operators increased massively.  But bricklayer and stonemason apprentices?  Is that because apprenticeship programs have disappeared, or are there that many fewer bricklayers?  I would guess that barriers to entry have dropped.  From anecdotal information, it sounds like Hispanics do a lot of the bricklaying today.