It's quite funny to see that the downsides of near-instantaneous at-will employment are hitting companies so hard that they're willing to engage in such a boneheaded scheme, when sympathy is normally focused on employees.
Perhaps if these companies want to bring back some semblance of employee loyalty, they should start incorporating longer termination notice periods in their contracts and making employees happy before they want to leave, rather than treating individuals as interchangeable cogs and getting what they ask for.