How automation will wipe out (private sector) unions...

It's pretty basic economics (Reason):

Forecasts differ on the specifics, but they generally point to automation being disruptive as far as traditional workplace roles are concerned. A recent Oxford University study put nearly half (47 percent) of all jobs at risk of replacement by automation in two decades. A Wired article puts the number at 70 percent by the end of this century.

Computers are getting smarter and stronger while employees, with their health insurance, pensions, and vacation time are becoming increasingly expensive. The writing is on the wall; plenty of jobs, at least as performed by humans, aren't long for this world.

I think the more interesting question will be how long we will tolerate the public sector unions who earn far more than their private sector peers and the politicians who have been beholden to them.