Will fantasy outlive Science Fiction?
Will fantasy outlive Science Fiction? I think so. Fantasy is timeless. Science fiction is based on futurism, a particular view of how the future stands in relation to the present.
I am here distinguishing 'futurism' from 'millenarianism'. The world view of futurism is the view that the future will be to the present as the present stands to the past: but it is "the past" of Darwinian evolution, not the past of the Book of Genesis. In futurism, if the past was more primitive, the future will be more advanced. The past was the horse-and-buggy; the future is the flying car. The past was the ape-man, the future is the bald, dwarf-bodied big-brained superman, perhaps jaunting around in a three-legged war machine. Or maybe the future is Mad Max jaunting around in his gasoline-starved car with his meat-starved mad dog, depending on where the speculation thinks the world is heading: but in any case, it is a natural, not a supernatural.
In the millenarian world view, on the other hand, the past was The Golden Age, the Age of Saturn, and the future is the Kali Yuga. The future is the promise that the Armies of Light will destroy the Sons of Darkness that rule the present world, all harms will be healed, all tears wiped away, and New Jerusalem descend from the clouds, or, if you prefer, Baldir the Good return from his exile in Nastrond. The end of history is accomplished by a supernatural agency.
With no offense to my fellow Christians, I propose that an audience whose view of the future is millenarian has no real reason to be curious about the speculations of science fiction: if it is an article of faith that the Twilight of the Gods will take place as prophesied, reading about The Invasion of the Living Brains of Mars has no appeal. If you already know that the World Tree will be burned by Surtur, what do you care about a story where Earth is pashed to bits by some wandering planet like Zyra, Bronson Alpha, Nemesis, or Mongo?