Ideally, eventually, we will have commuter rail service all the way to Westerly and perhaps New London, that is part of long range planning. But even once we get service as far as Wickford Junction, that is a bonus for South County. Driving to and parking at Wickford Junction should be an attractive option. The current set up, driving to Providence or Attelboro is not as attractive to someone in South County, once you've fought traffic through Providence, you might as well drive all the way to Boston.
Even for commuters going into Providence only, a Wickford Junction station with quick, easy, inexpensive parking should prove to be preferable to some over fighting Providence traffic and finding and paying for parking in Providence. Especially attractive if your employer does not subsidize parking, but does subsidize your transit. Also, we'll need somesort of MBTA/RIPTA combo pass system, something that is at the very least, on RIPTA's radar from what I hear.