Michael Ramlet writes:
We estimate that within 10 years, the number of uninsured Americans may increase by 10 percent. At the same time, premiums will rise faster than federal subsidies. The latter problem will be most severe when insurers release their 2017 rate increases in the summer and fall of 2016—perhaps the most awkward timing for the law’s supporters.
See also Risky Business: Will Taxpayers Bail Out Health Insurers? by John R. Graham.