The crime fear is central too Atlanta's discussion and has been for 50 years. The truth is that yes the crime might marginally go up - but the economic opportunities for both us going down and poorer folks coming up create less crime for the city as a whole. For example - we interviewed several nanny's from near Doraville and were willing to pay 10/hour but we just couldn't make it work commute wise. There are 100's of small businesses that can used skilled labor.
I like Alpharetta and trains will make it better. But having lived in Europe for a while I think the true argument is considering express tracks. When you get this far out in a subway system the trains are just too slow. Any further expansion should consider putting in express tracks between Lindbergh-5 points-Airport. That would shave 30 minutes off downtown and airport trips and then ridership from the suburbs would really go up. Even if they can't afford 4 tracks - a 3rd one for each rush hour would do wonders to ridership. John