What an absurd observation.
The logical result of that line of thinking is--- the Soviet Union.
For generations, they had full employment; and totally shared misery.
The libertarian notion that corporations can require anything of their employees, and that the employee need only go somewhere else if he doesn't like it is complete fantasy.
Putting reasonable limits on what corporations can compel their employees to agree with is not a slippery slope toward Soviet style communism.
Ironically, most of the people I know that are libertarian argue with the hiring managers and often get the company to waive the arbitration requirement.
It's not as simple as Free Market Yay! Or else COMMUNISM!