Hey Fast, you hit the nail right on the head! Despite my intense dislike for the new Delta livery I am still a fan of Delta although as I alluded to another post, their service has slipped a bit over the years.
As Fast mentioned, changing an airliners livery isn't necessarily going to increase business (look at US Airways).
What matters is service, being on time, and safety. Delta (for the most part) has been able to do this although the service has to improve. Just changing the livery isn't going to change service, except maybe the wallets of the those that paint the airplanes!!!