The commissioner may by order terminate the operation of the association as to any kind of insurance with respect to which the commissioner has found, after notice and hearing, that there is in effect a statutory plan of the United States government to avoid excessive delay or financial loss to claimants or policyholders because of insurer insolvency. Such order for termination shall continue the operation of this chapter with respect to prior insurer insolvencies not covered by such plan. The order shall also provide for a proportionate distribution of the assets of the association to insurers which will cease to be members of the association on the effective date of the order.