I think you mean "at-will employment". All American states have that. "Right to work" laws refer to laws banning union contracts from creating "closed shops".
I think a lot of the talk is also due to unhappiness with the economic trend that is drawing the median and minimum incomes closer together, which is a reversal of a trend that gave widespread optimism and contentment.
Also, many employers expect contractors to be always available, or available full time for long stretches, but that makes it impossible to diversify their income.
So it can become very one-sided. A possible answer would be to make it normal for employees to have contracts with several employers at once, but that can create conflicts of interest in a lot of professions, and would make things like IP very messy.
If working for your employer became a negative ROI, you'd quit your job.
If employing somebody becomes a negative ROI, I don't see why it shouldn't be equally easy to stop employing them.
As long as the relationship is mutually beneficial, neither party will terminate it.