What will unions do with Open Source development?
Let's say the unions get huge wins, make huge gains, and unionize essentially all programmers. They decide to call a strike. What happens to Linux development? What happens to tons of other OSS development? If a strike only affects closed-source software, that's an incentive for users to go Open Source, but it's also an incentive for unions to try and destroy it.
This isn't like the auto industry union vs shadetree mechanics, which was never a conflict because shadetree mechanics are fundamentally not a threat to the auto industry and its unions because the shadetree mechanics of the world can't make their own credible car as a hobbyist project.
The "shadetree mechanics" of the OSS world have made large chunks of a software ecosystem as a bunch of interconnected hobbyist projects, which is a distinct threat to the software industry's UAW-equivalent's ability to exert pressure on companies that make and sell software.