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"If time travel were to one day be possible, why don't we run into people now who have traveled back in time to us?"
I'm not a science fiction guy, but I like this question. My first inclination was to answer that if time is a train, then we are simply at the front of the train and there's no one in the future who could "come back" to us.
But if time travel were to be invented tomorrow and I were to go back to, say, 1953, wouldn't the people of 1953 have believed up until that point were in the front of the train as well? So can we safely assume that we are in front of the train?
(Side note: Want to feel old? In Back To The Future II, Marty was transported into the future with a specific date of October 21, 2015.)