Which begs the question - are science fiction writers the modern prophets?
Ahem...incorrect use of English, my SF-reading friend:
http://en.wikipedia.org/wiki/Begging_the_question
But to answer your invited-but-not-begged question: No, since the word "prophet" implies some sort of supernatural ability. The more correct term, I think, would be "forecaster" or "predicter". Forecasting is based on science and observation, and since this is science fiction, not fantasy, wanna-be prophets need not apply.