Unions are a symptom -- not a cause. It isn't about unions, as that guy thinks.
Follow the money trail.
There were richer profits to be had investing in start-up in places like Indonesia & Mexico where labor costs were pennies an hour and governments were happy to see any industry move in at all (for a while, at least).
Once those were up and running, the protective tarrifs and anti-dumping laws that had previously protected US industry had to be gutted to protect investment banker profits, so they (of course) were. It was a re-play of the repeal of the English Corn Laws in 1832 -- one of the same economic cars that have been circling the block throughout history. Only instead of reducing the common people to economic desperation (enabling their exploitation as bare survival level wage factory labor, and the financeers to buy up what had been the productive farms they'd owned, letting them deteriorate into hunting preserves), there were no factories left. So now we just have economic desperation. And college girls paying their way through school a pole dancers in strip joints.
Unionising the little we have left would accomplish nothing.