The hope is that as talent mobility increases, the power imbalance will ebb. But it is rare for the power to be perfectly balanced.
That's the difference between the powerful and the powerless. The powerful thinks the imbalance is a fact that will never change; the powerless thinks that must change.
The problem in corporate world nowadays is that the powerful people disguise this difference all the time. For example : "hey, you can negotiate your salary and if you disagree, you have total freedom to go somewhere else. How powerful you are !"
I'll sure read your book, but I'm under the impression I'll see another, maybe very sophisticated disguise...
(yes you can call me a "socialist" (in the European sense) :-) because all of this is super political in fact)
But the bigger issue is that people have ended up in a position where they are powerless. And that is because the system doesn't see them as valuable. In an economic sense, unskilled labor isn't that valuable. But in a philosophical sense, those human beings are part of a society that should be looking out for them.
The best instrument of change in this case is government action (which I suppose means that holding this opinion also makes me a little bit socialist).
The root cause of the problem, at least in the United States, is that our educational system (aided and abetted by institutional discrimination and/or neglect) has failed to give many of its citizens the skills and knowledge they need. Furthermore, the social safety net is both inconsistent and insufficient.
As a mere business book author, I have a hard time tackling such problems, though I've certainly offered my opinions.