Elliminating survivor benifits to the survivors of same sex marriages would save those funds and protect the security of these retirement funds.
Changing the actuary numbers used would emediately reduce payments to all retirees.
Increasing payments into retirement funds would help include same sex into the actuaries, however, there would be 40 to 50 years worth of fund deposits missing.(Years worked until the death of one spouse.)
My bet is, if same sex survivor benifits were eliminated, they would not have gotten married in the first place.