The article you cite points at resistance to tax increases as the culprit. No state can afford single payer without a tax increase to fund it, so the talk of "budget issues" is misleading. It's simply a matter of convincing everyone to trade paying private insurers for a tax increase. Vermont got pushback from the business community saying it would hurt the economy, but that seems suspect to me considering they would not have to pay private premiums anymore. That and the economic benefits of a healthy population.