I'm sure you can find plenty of example of both. But TBH, I don't think it really matters which side you try and point the finger at after decades of decline - the point is that the employee/employer relationship has fundamentally changed, and it's hard to see it ever changing back.
Agreed. It's not about blame, just that employers are almost always working with a better perspective and more information.
Business circumstances made it advantageous, and then necessary, to break the social contract.
It might be possible to go back, but I can't imagine any series of events that leads in that direction which doesn't break the global economy in the process.