The State of California does hereby pledge to and agree with the holders of any bonds issued, and with those companies which may enter into project agreements with authorities, pursuant to the provisions of this article, that the state will not alter or change the structure, organization, programs, or activities hereby vested in public agencies or authorities until such bonds are fully met or discharged and such project agreements are fully performed or discharged, on the part of authorities or public agencies, as the case may be; provided, however, that nothing herein contained shall preclude such alteration or change, if, and when, adequate provision shall have been made by law for the protection from impairment of the contracts represented by such bonds and project agreements, and such right to so alter or change is hereby reserved. Authorities are authorized to include this pledge and undertaking of the state in such bonds and project agreements.