Some works of sci-fi, especially classic works like Orwell’s 1984, aren’t even in “futures-space” anymore; those exact scenarios are no longer possible. That doesn’t decrease their value at all. Science fiction, to me, is less about sampling from futures-space than about asking “what if?” and then telling a story about it.
I think of science fiction as of sampling from futures-space; so it doesn’t have to be the most probable scenario, just somewhat plausible.
Some works of sci-fi, especially classic works like Orwell’s 1984, aren’t even in “futures-space” anymore; those exact scenarios are no longer possible. That doesn’t decrease their value at all. Science fiction, to me, is less about sampling from futures-space than about asking “what if?” and then telling a story about it.