When all of the bonds, interest coupons, and obligations of every nature whatsoever, for the payment of which the revenues of any project or group of projects have been pledged in whole or in part, either originally or subsequently, primarily or secondarily, directly or indirectly, or otherwise, have been paid in full or when a sufficient amount for the payment thereof has been set aside in trust for the benefit of the bondholders or other obligees, the title to such project or projects, regardless of location, shall revert to the State of Georgia.