Health and Human Services Secretary Sylvia Burwell announced recently that she expects 10 million people to be enrolled in health-care coverage through ObamaCare’s exchanges by the end of next year. What she didn’t mention was that in March of last year the Congressional Budget Office predicted that 21 million people would be enrolled in 2016 — more than double the new estimate.

The administration says the difference can be explained away: For instance, fewer companies dropped coverage than expected, thus fewer employees are migrating from employer-sponsored plans to the exchanges. “We haven’t seen much of a shift at all,” Richard Frank, a health and human services assistant secretary, told USA Today.

But the question isn’t where Americans are getting health insurance. It is whether ObamaCare will provide more Americans with affordable insurance for decades to come.

Read the article “The Slow-Motion Implosion of ObamaCare” on wsj.com.