IANAP (I am not a pilot), but I know a few people going for their licenses right now, and I get the impression that pilot to tower communications are all business. Each side knows what the other is going to say when he says it, kind of like a script, and it's all both relevant and necessary to the task at hand (flying the plane). It's a bit different than the highly improvisational, distant-focused conversational style employed by multitasking commuters.
FAA regulations prohibit talking about non-flying related things between crew members during takeoff and landing approaches, and a violation of this reg was blamed for causing a crash near Buffalo earlier this year
I agree that we'd be better off if people adopted the no-nonsense conversation style of pilots while talking on the road, but I doubt many would go through a certification as rigorous as pilot training to gain the privilege. That said, a study probably wouldn't hurt. Even if it fails, it might quiet those who insist "Well I
can talk on the phone while driving quite safely enough, thank you very much! I need to call you back, there's a telephone pole in my engine compartment."