The consequences of the loss of CSR payments, and the potential workarounds available to the state, are different in New York and Minnesota, which are the only states to have availed themselves of the option to establish a "Basic Health Program" under the ACA (referred to in NY as the "Essential Plan"). In these two states, under the Basic Health Program, affordable coverage is made available to individuals with incomes below 200% of the federal poverty level in lieu of subsidized exchange plans. The federal government, instead of paying premium tax credits to individuals and CSR payments to insurance companies, pays 95% of the amount of both of those types of subsidies that enrollees otherwise would have benefited from directly to the states in order to fund the Basic Health Program. So the termination of the CSR-based component of the federal funding would have the effect of blowing a large hole in the state budget, imperiling its Basic Health Program. (Unlike in other states, there would be almost no counterbalancing increase in the size of federal premium tax credits to offset the loss of the CSR payments, because most CSR-eligible consumers are enrolled in the Basic Health Program instead of the exchange-based plans on which premium tax credit amounts are based, so the dynamic Sol described above (i.e., elimination of CSR payments leading to increases in premiums leading to increases in premium tax credits) would not occur.)
It is currently unclear whether the Trump administration intends to cut off the CSR-based component of the federal funding for Basic Health Programs. The official executive pronouncements of the discontinuation of the CSR payments appear to refer only to CSR payments made directly to insurers, which is not the case for the federal funding of Basic Health Programs. But I believe the underlying rationale for the discontinuation of the payments--the purported unconstitutionality of paying them by virtue of the failure of Congress to specifically appropriate funds to do so--applies equally to the CSR-based component of the federal funding for Basic Health Programs.