Is it time to merge employer-based and state-exchange insurance markets?

The Affordable Care Act (ACA) created state-exchange health insurance markets to allow access to health insurance for people with pre-existing conditions, link premiums to age instead of health status, and provide subsidies for low-income households. The ACA also maintained long standing tax preferences provided to employer-based insurance and includes rules favoring employer-based coverage over state exchange coverage. Currently around 11 million Americans obtain health insurance from state exchanges compared to around 157 million who obtain health insurance from their employer.