I think Faraday was right. Whatever happened, happened. I don't think Sawyer and Jack and those people are actually in the past. They're still traveling forward in time, they're still getting older, but instead of going from the year 2005 to 2006, they went from 2005 to 1974(I know they traveled to different time periods before that, but I don't remember the years). This explains why Rousseau didn't recognize Jin when they met in season 1 and why Ben isn't dead.