Health and Human Services Secretary Sylvia Mathews Burwell on Wednesday downplayed the significant challenges facing Obamacare as “bumps” in the road, and spoke optimistically about her agency’s ability to enroll the younger, healthier people that are needed to keep the program in the black.

Obamacare is about to enter its fourth enrollment season, which Burwell said was a rich, new opportunity to reach the millions of people who are still not insured under the law.