The Obama administration estimated that the average monthly effectuated enrollment in the exchanges was 10.4 million people in 2016. This is significantly below original projections from the Congressional Budget Office, which estimated that 21 million people would be getting their coverage through the law’s government-run exchanges in 2016.
According to the IRS, in 2015, 12.7 million taxpayers claimed one or more exemptions from Obamacare’s mandate to purchase coverage and another 6.5 million taxpayers paid the penalty rather than sign up for coverage.So 11.4 million signed up, but 19.2 million were eligible and declined. I've also read that a previous Heritage Foundation estimate of 14 million new insureds included 11.8 million who were shunted into Medicaid, leaving only 2.2 million who'd signed up in the post-ACA private individual insurance market. This article quotes an AP estimate that 4.7 million pre-ACA insurance policies (in the individual market?) were cancelled upon implementation of the ACA. Again, I'm not feeling the vibe that the repeal will be worse than the implementation.
Still, there are definitely people out there, like myself, who bought Obamacare policies and are wondering how they'll replace them, now that they've lost the protection from pre-existing conditions that they previously enjoyed under their longstanding pre-ACA guaranteed-reissue plans. I've been hearing that the Republicans had some kind of protection in mind for people with pre-existing conditions, and of course Trump says he does without explaining how it would work. It appears that all four Republican plans currently circulating include proposals for some kind of one-time opt-in for people who have maintained their coverage, much as was the case under the late-1990s HIPAA law.