American workers have been reaping a smaller % of the benefits of their work relative to American business owners since the 70's. This has led to all kinds of negative outcomes but relevant to this thread, it has led to a dramatic decrease in the dignity of work. Popular culture and management/ownership attitudes have exacerbated that problem.
I still firmly believe demographics heavily favor the American worker in the short, medium, and long term relative to the American business owner. So my opinion is that the wave of leverage the American worker has been wielding recently isn't going to go away over any extended period of time. There may be economic downturns that temporarily reduce the leverage but generally, I believe there will be more jobs than workers moving forward.
One thing on the topic of work that I have been thinking about is that there may be underrated benefits of reducing working hours. More workers working fewer hours means more elasticity in the workforce. This especially comes into play in times like the pandemic or other emergencies, but has value at all times due to mitigation of turnover risk. I believe if we decoupled healthcare from employment that a tipping point would be reached to make a significant reduction in the 40 hour workweek a high value proposition for employers.
As to Musk's comments, of course he wants slave labor. The American worker has lasted in the face of cheaper competition for a long time, and that won't change anytime soon. My unresearched opinion is that while young American workers want to work less and are less motivated by traditional means (and are probably less resilient than older workers), they are far more intelligent and adaptable than their older counterparts, so they still have superior value to foreign workers.