As for Latin, a common language would be good to bring all the bishops of the world together. More important still, we need to bring back the common theology that was taught when Latin reigned in the seminaries and universities.
"More important still, we need to bring back the common theology "
That's the goal, Latin is a part of the means.
"As for Latin, a common language would be good to bring all the bishops of the world together. More important still, we need to bring back the common theology that was taught when Latin reigned in the seminaries and universities."
I suspect that most if not all speak latin to varying degrees. The issue is "varying degrees". If you're a Bishop in China, how often do you actually get to converse in latin? I suspect not so much, and probably with an accent that makes it difficult for you to be understood in any case.
And then there is the issue of the eastern churches, some of whom (the Melkites come to mind) might not be willing to speak latin in an official setting such as a synod. Regardless of whether they happen to speak it fluently.
Pope Benedict is a linguist. Switching between languages for him is fairly easy. He's also a scholar and very interested in what people are thinking. Sometimes things are better expressed in one's native tongue than in a second or third language.