The thing is, there isn't enough of an adverse consequence for companies to do this. For example, if companies got fined for large layoffs, or large number of employee cuts over a short amount of time (just to prevent loopholes of "slowly" laying off people), then this would be far less likely.
Layoffs have an impact on far more than just the company. They have an impact on the state, they have an impact on the side service oriented businesses created because of that company, and they have a direct impact on the lives of the workers and their dependents.
It shouldn't be "free" for a company to have a ripple effect of this magnitude. Regulations like this would force companies to grow in a sustainable fashion, since having a "break" like this would be extremely expensive to the execs and major shareholders of the company.
FWIW I have barely thought this out and this might sound ridiculous.