Wait, it's worse than that.
An employer only pays a penalty of $2k on each uninsured, AND subsidized (AGI below $88k for a family of 4) employee.
So, let's say a company is a large defense contractor with 50k employees, where the median salary is in the 70-80k range. That means if they didn't offer any insurance, it would cost them $50M a year in penalties.
Considering most companies (like the one above) will give you about $3-4k a year for not using their insurance, we can make the assumption they spend about $150-200M for that benefit (they are self-insured).
And the employee contribution for a family of 4 is about $4-5k/yr
So the company could realize a net profit of. $100-150M by simply not offering insurance anymore.
Now that unsubsidized $88k for a family of 4 household has to buy insurance (kaiser quotes $11k annually) and gets ROYALLY SCREWED.
Or, they could simply pay their own penalty, $2k/yr at that income level, pocket the $2-3k difference between their current contribution and the penalty, use that for day-to-day medical stuff, and just sign up, use, and cancell, insurance if they need it. In that case, the insurance company gets royally screwed, and goes out of business.