The Obama administration’s goal for Obamacare signups next year is realistic, but may not be enough to appease insurers worried by the marketplace’s risk pools, experts said.

The administration on Wednesday said it is hoping that 13.8 million people will sign up for Obamacare for the 2017 coverage year, about 1.1 million more than the 12.7 million who signed up for coverage in 2016. Of that 12.7 million, about 10 million have paid for coverage.