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The incoming administration will take office just as the latest ObamaCare enrollment tally comes in, delivering a potentially crucial verdict about the still-shaky healthcare marketplaces …. The Obama administration has struggled for several years to bring young, healthy people into the marketplaces, which is needed to offset the medical costs of older and sicker customers. These problems are coming to light this year, as insurers get their first full look at ObamaCare customer data. Some, like UnitedHealth Group, say they’ve seen enough, and are already vowing to leave the exchanges …. experts warn that if the numbers don’t improve this year, more insurers could bolt. That would deal a major blow to marketplace competition, while also driving up rates and keeping even more people out of the exchanges.