“Much attention has been given to the argument that without the individual purchase mandate, other parts of the health care law would become unworkable. Much less attention has been given to the fact that without the states forced to be on board with the Medicaid expansion, the law’s health exchange subsidies might be fiscally unworkable. The Supreme Court may have just set in motion of chain of events that could lead to the law’s being found as busting the budget, even under the highly favorable scoring methods used last time.”