Given the negative world wide trend with birthrates, this should be a priority with every developed country even if it eventually comes at the expense of elderly socialized healthcare.
Japan already bet on it and the robots haven't materialized, so maybe it's a bad strategy or maybe they bet too soon or maybe it will turn out they did it at the right time.
You’re right about the main benefit of population decline though. It gives Nature a needed break
Little is being done to give them assurances they will be able to provide for themselves.