Unions have to make a comeback. Look at German unions. They are organized over a whole industry, not just companies, have a seat on the board of directors. I think this system works really well.
I'm not confident that Unions would work for huge issue that is coming up - Mass Mechanization. There will be very few jobs Robotics will not be able to replace in a decade or so. This will easily facilitate few people owning large chunks of means of production. I don't see any serious solutions to this issue on the horizon.
Why would they though? This doesn't magically happen and unions didn't magically disappear. There are strong disincentives towards forming unions (i.e. the ability to offshore labor) and as long as those exist, nothing will change.
Yeah, but that's in Germany. They evolved that system over a long period of time, just like we've evolved our current (dysfunctional) system over a long period of time. You can't just change; that's like telling a devout religious person to just stop believing in that religion and adopt a secular worldview. Sure, the German system may work very well according to actual measurable metrics as seen by multiple independent observers, but extremely religious people don't care about evidence and won't change their beliefs because of it. That's where we are as a society.