Proposals for avoiding a Social Darwinist Future that are not already being implemented by someone, possibly us?
It's not social Darwinism we have to worry about--it's regular Darwinism. Social Darwinism is an ideology, Darwinism is what happens by default if no one stops it.
Death, long lives, uploading
Mark Rosenfelder (aka zompist, of language construction kit fame) writes about the advantages and drawbacks of mortality and its alternatives, in fiction and real life. Rosenfelder, as an author, clearly takes Fun Theory very seriously. After discussing the mental and physical decline that age usually entail, he assumes that the most difficult to surmount of these problems will be the loss of mental flexibility and tolerance of novelty. He then uses this obstacle to offer interesting fun-theoretic arguments against uploading and cryonics:
And how he addressed the issue in his own far-future conworld: