There's nothing in the articles that implies this. Backdooring a CA only helps if several things hold:
1) They can not only intercept but also rewrite traffic on the fly. Possible, but if so, not yet mentioned in any leaks.
2) They're willing to take the chance that someone might notice.
So an operation against a single site, definitely possible. But they are clearly desperate to grab everything, all the time! Their whole MO is not targeted investigations but to spy on everyone simultaneously. You can't use a rogue CA to do that. They'd be detected immediately, if only by geeks setting up SSL for their new personal VPS and suddenly noticing the CA their browser gets isn't the one they installed.
The problems with SSL are not that CAs exist. The model holds against the global adversary who wants to decrypt everything. The problems with SSL are almost certainly more prosaic - many websites can be automatically hacked and their keys stolen without the owners ever knowing. In the default config that allows you to then decrypt all past traffic as well. Some implementations will use old, weak keys that were strong once upon a time but have since become obsolete. Some implementations will have bad random number generators. Some implementations will run on VPS providers and are subject to side channel attacks by colocated VMs. Some keys can be subpoenad and others can be obtained by covert agents. And of course you still leak traffic metadata even when SSL works perfectly.
There are lots of ways to attack SSL that will work some of the time, and that's exactly what the leaks imply - they can beat encryption sometimes but they don't have a magic skeleton key to everything.