The argument I've heard is also in the article, "the change will enhance patient safety because there will be fewer handoffs from doctor to doctor." I've been told studies have shown this--of course there's a limit. I thought that limit was 16 hours (the previous max listed in the article). I'm sure handoff procedures also affect this. When our first son was born the nurses would come in and verbally handoff in front of my wife so she could clarify and confirm things (unless something critical was happening). You could see the nurses scribbled notes before handoff and they were diligent in recording things in their computer system.

On the business side, are doctor's paid hourly? I imagine having fewer doctors paid overtime would be cheaper overall. At least in other professions after 12 hours they get paid double-time.