You can shoot the messenger with accusations of "negativism," but this won't change the facts. The good news is that when you face these facts, you are no longer being distracted by the up-beat happy talk of "the-cup-is-half-full" status quo maintainers -- the attitude that all we have to do is continue being friendly and nice, or implement yet another pre-packaged parish program, and then all the problems will take care of themselves. This may not be altogether good news, but the news that is good is that you're at least getting the truth and no longer living in the bubble of a passing illusion.
A recent book that takes a dispassionate look at the relevant statistics and trends is by Christian Smith, Kyle Longest, Jonathan Hill and Kari Christoffersen, Young Catholic America: Emerging Adults In, Out of, and Gone from the Church(Oxford University Press, 2014).
The video below highlights and analyzes the more salient conclusions of the book.