Possibly.

I ran across this years ago when I bought a Trek MultiTrack for touring, only to discover someone had fitted it with skinny Matrix rims that wouldn't even accommodate 700x32 tires. Even with Sheldon's looser guidelines. Same thing happened this summer when a friend scored a very nice Specialized Expedition that had been upgraded(!?) with Mavic open-pros. Even 700x28s were just outside the recommended range. Poor choice of rim for a very capable touring machine.

But as I was learning about this I asked at some shops and they were universally clueless on the topic, which tells me that people get away all kinds of mismatches without problems.

But back to the OP, this article certainly jives with Mavic's decision to widen the new Ksyrium rims. I'm going to save it for future reference.