If the supply of labor is so high then Boeing can hire scabs. I don’t follow how on the one hand the workers add so little value and are so replaceable that they deserve no raise and then on the other hand their strike could kill the company.

I also don’t follow how paying union dues is a problem if they’re going to get you a 25 - 40% raise whereas you’re unlikely to get anything on your own. I get not everyone likes unions, but you’re making a pretty compelling case for them IMHO.