It will probably be more than just a pop. Raleigh, like Richmond Staples Mills, is in a situation that is becoming less and less common for Amtrak. To wit a station stop where the station facilities appear to be severely constraining major ridership demand. The real question in my mind is not how many are choosing Cary over Raleigh. Its how many are choosing to fly instead of take the train because of the differences between RGH and KRDU. Many rail stations lack long term parking and other amenities typically associated with modern airports. Making those investments will take time.
gokeefe