It is worth remembering that because of policy and political decisions many of the uninsured will not have access to the options for coverage available under the Affordable Coverage Act (ACA).  At least two major groups are important:

Thus about 14 million (see Table here) are not even eligible for coverage for policy or political reasons (about 30% of the total 47.9 uninsured),   and even if every uninsured person would obtain insurance, the uninsurance rate would drop from 15.4% to 4.6% and this would require full takeup of coverage, which will not be likely to happen.   

Eventually these illogical policy decisions may or should be reversed.  In the meantime, some critics seem to complain that the ACA is not working well if it leaves many uninsured.  But of course politics is the major reason why this is happening.