Ezra Klein gives the data another look:
[A]s the CBO explains on page five, part of the increase in the type of insurance being purchased is the result of "people’s decisions to purchase more extensive coverage in response to the structure of subsidies." In other words, the change is driven by the subsidies, not offset by them...Premiums for the same policy in the individual market fall by 14 to 20 percent. But people in the individual market, who are largely low-income, will now have the opportunity to purchase better policies that cover more expenses and provide more security.
DiA makes the same basic point.