How Many Must Lack An Employer-Sponsored Insurance Option Before We Can Get A Public Option?

According to the report "Great Recession Accelerated Long-Term Decline of Employer Health Coverage",

"Between 2007 and 2010, the share of children and working-age adults in the United States with employer-sponsored health insurance dropped 10 percentage points from 63.6 percent to 53.5 percent, according to a new national study by the Center for Studying Health System Change (HSC)."

This isn't a new trend ... just a spike in the trend.

And yet, while the employer-sponsored system declines, conservatives continue to stand against a public option. How much further will the employer-based system have to fall apart before we can have at least a public option if not a full single-payer system?