I've seen some similar things, and it's interesting data. From everything I've read, this is a general trend worldwide, with exceptions in many African countries and scattered others. But it's important to note that the total number of Christians is slightly increasing worldwide, due to population increase and the African boom, even while the percentage drops slightly worldwide.
One of the things I found most interesting was the data on unaffiliated people. "Unaffiliated" certainly doesn't mean non-religious. But the article has an interesting data point when it mentions that 31% of "nones" identify as agnostics or atheists (I'd imagine that split being heavily toward agnostic), which is up 7 points from 2007. That's the most interesting point to me, because in the past those numbers have held steadier even while "unaffiliated" increased slightly.
I see this as mostly a good thing, mainly because we're reaching a point where there's going to be more of a homogeneous distribution of beliefs in society. Which, over a few generations, will equal more tolerance. I honestly don't think quite as much will change as many of my fellow atheists might - good and evil in society are human good/evil, minus a couple negative issues where religion plays a definite catalyst. But there are other reasons it's a positive trend, as mentioned. Mostly, though, I see this as neutral. Interesting, but not earth-shaking.
Banal as comments usually are beneath blogs like that, one comment touched on an interesting point. Is the far religious right actually driving people away from religion more quickly, because people don't want to be associated with it? I was Catholic growing up, and I listened to reasonable, moderate Catholics say they were ashamed to be associated with the Church as they went through one child rape scandal after another. They knew enough to know that their beliefs were NOT those acts, but it still weighed on them. What affect does this have when you multiply that by all of the media channels we have in today's world, compounded by the vocal extremists operating under a Christian name? I'm not conflating the two personally, but for someone growing up and seeing it all around them, how could it not be an influence?