The purpose of RCW 74.04.600 through 74.04.650 is to recognize and accept that certain act of congress known as Public Law 92-603 and Public Law 93-66, and to enable the department of social and health services to take advantage of and implement the provisions of that act. The state shall provide assistance to those individuals who were eligible or would have been eligible for benefits under this state's old age assistance, disability assistance, and aid to the blind programs as they were in effect in December, 1973 but who will no longer be eligible for such program due to Title XVI of the Social Security Act.