Upon the termination of the commission, the Coal-Workers' Pneumoconiosis Fund shall close and the company shall offer insurance to provide for the benefits required by this article until at least December 31, 2008. All claims payment obligations, including indemnity benefits, medical benefits, administrative and all other expenses necessary for the administration and defense of claims, where the date of last exposure is on or before December 31, 2005, without regard to the date the claim is filed, shall be an obligation of the Coal-Workers' Pneumonoconiosis Fund created in this article and not of the company.