I think the international appeal of SF is quite understandable since the kinds of people who like to read it, are, by the nature of the beast, interested in other cultures, of which other nations on Earth are the closest available example.
Stanley SchmidtIts limitations are those of the physical universe: it won't let you play with some really wild ideas that aren't possible, but are fun to speculate about.
Stanley SchmidtWhat SF can do better than anything else is show us the range of our possible futures, and what we can do to realize the good ones and avoid the nasty ones.
Stanley Schmidt