Why do you think stagnating wages and declining unions coincide?
lazy workers, fortunately there's a solution:
https://twitter.com/TheEconomist/status/1178429549689921536
Just told my staff over the group chat they're getting new gadgets
Kidding aside, the unions can't beat the autisty tech nerds of Silicon Valley.
I too, look at 200 years of labor union successes and failures and then choose the last 30 to make definitive, absolute statements on their utility.
You can look at 200 years of successes of traveling by carriage but these days I'd rather use a car to get around. 
pray tell, if unions are carriages then what does the car represent?
An example in my field of work would be "TheFutur" a platform where creatives learn how to do business, ask more money for design and negotiate better.
The key is a better educated workforce that understands how business works and can take care of themselves better and I'm in favor of UBI or the Freedom Dividend(TM) to vastly simplify the system of benefits and subsidies.
These two examples are from some highly talented people. Not the same dumb dumbs banding together. Take videogame journo's for example.
Would it make any difference if Imran Khan and Patrick Klepek negotiated their wages together instead of alone? lmao.
The idea of a union is based on the fact that human labour can be used as a bargaining chip in a negotiation and that's simply not the case anymore.
Because in a globalized world there's always some scrub willing to do it for way less.
