I'm afraid this could be true. The only pry-bar big enough to pull the truth out and amplify it to America at large is the MSM -- and it doesn't look like they are ready to eat their own yet.
After all, what's in it for ABC/NBC/CNN/etc to sink CBS? Ratings? Competition? Not if they fear that by weakening the MSM stronghold, they (ABC/NBC...) could be brought down next on come similar issue. (i.e. They're all guilty as sin of this type of fabrication in general, and they all have tons of "dirt" on each other -- so they figure they'd better cover for CBS for now. (Didn't you see Ted Koppel last night start out by referring to "my good friend, Dan Rather")?
Right now they want to avoid mutual destruction... too bad really.
I'm normally not such a pessimist, but the once-cannibalistic (i.e., they used to eat their own) MSM are now seemingly united as the "media wing of the Democratric party".