The article is arguing that private payers don't reimburse rural hospitals enough, not that lack of medicaid or obamacare is an issue. Perhaps your premise is correct but it is at odds with the article, I would be interested in hearing more about why you disagree with the article.

From the article "The biggest problem facing small rural hospitals is inadequate payments from private health plans. Most “solutions” for rural hospitals have focused on increasing Medicare or Medicaid payments or expanding Medicaid eligibility due to a mistaken belief that most rural patients are insured by Medicare and Medicaid or are uninsured. In reality, about half of the services at the average rural hospital are delivered to patients with private insurance (both employer-sponsored insurance and Medicare Advantage plans). In most cases, the amounts these private plans pay, not Medicare or Medicaid payments, determine whether a rural hospital will have to close".