It seems pretty obvious to me that if you find that some US unions are rather bad, which is probably true because most of everything is bad, the right solution would be to strengthen the good ones. And if really there aren't any good ones, a good solution would be to organize to create better ones based on what has worked in the history of the labor movement united States. And based on what is working abroad, especial in more democratic societies like in Scandinavia
This is how it has always worked. No worker right we take for granted - and in the US you are missing some! - has ever been gifted to us. They happened because a small group of people decided to organize and do something about it.
Not saying that's easy, but the base principle is pretty simple and according to the research paper - and history in general - clearly worth it.
And to be transparent, if someone says to me that what I describe is impossible, i will listen to the arguments, but my baseline assumption would be that he spreads corporate propaganda, or worse, is victim of it.