Pardon me for being realistic, but I would say exactly the opposite. If the CAs were compromised, that would be the biggest story by far in Snowden's documents, and it would have appeared in the newspapers by now.
I would say they are compromised just by watching Moxie Marlinspike's presentation about the shitty state of CAs and how he was able to find signing certs just laying around in unprotected directories https://www.youtube.com/watch?v=Z7Wl2FW2TcA
The Snowden documents (that have been released) were actually very light on technical information. The real details of how BULLRUN works are probably compartmentalized to a very small group of people and not accessible to a random sysadmin.
So it is entirely possible that CAs have been compromised and Glenn Greenwald and the rest of those with the Snowden cache have no idea.
As I commented yesterday on HN, if this ever came to light, it would be the Internet's version of a "Lehman Brothers" style collapse.
Thinking about it more, it would actually be awesome. The cabal of CAs would fall and hopefully a bulletproof distributed system model would eventually replace this snakeoil industry.
