A passenger rail line along W&A could be extended to Acworth and Canton and cut over to midtown and downtown so I don't really understand this statement on the Vinings Association site: 'Transit in the Marietta Boulevard corridor would serve only "local needs" and would have no "regional utilization". Regular "local" bus service would adequately and appropriately serve this corridor. Perhaps existing bus routes serving this corridor could be improved, but spending significant transit dollars in this corridor is not warranted.'
I don't see how a commuter option that goes through the centers of Vinings, Smyrna, and Marietta along with passing by Cumberland's transfer station at the Cumberland Mall wouldn't be regional. The level of density of professional lofts being built along Marietta Blvd doesn't make busses a feasable way to handle future commuter needs and commuter rail would accelerate growth of professional housing units, which would have a positive impact on the Northwest region and Vinings. I imagine that regardless of what Cobb County decides, there will be a rail line along Marietta Boulevard in the near future and it would help Cobb County to tap into it. High-capacity passenger rail could carry a lot more people from exurbs like Canton than BRT could.
Additionally, there is more high-density housing being built in Vinings (Paces Ferry) and Marietta and these new developments are in walking distance of the rail crossing.
Finally, I imagine that a lot of the driving force of this assessment was the potential negative impact of commuters coming from Bankhead, however the demographics of Marietta Blvd and Bolton Rd have improved and if the rail option avoids Bankhead Highway, the commuters from Bankhead will be generally young professionals either going to midtown, downtown, or Cumberland. However, I wouldn't discount the possibility that it could also bring new business to Marietta.
I believe that using the W&A line will have a greater positive impact than a BRT line.