According to this article in The Register the RIAA has for 2 years been supressing figures which EXPLAIN the drop in sales that are so zealously blamed on the P2P industry.

Research by George Zieman gives the true reason for falling CD sales: the major labels have slashed production by 25 per cent in the past two years, he argues.
Increasingly hysterical comments from RIAA chairperson and chief random-number-generator Hilary Rosen suggest that many billions of potential sales have been lost.

So why isn't the RIAA trumpeting this affirmation in music sales, and something of a renaissance in its business efficiency?

Perhaps because the RIAA's version of the truth doesn't fit with the facts. Zieman points out that only 3,000 sales of each of the missing 12,000 titles would have been enough to see overall growth continue to grow.
I have to say I agree with the authors summation that the RIAA is doing an excellent job of imploding on its own, without any help from us. However, I prefer to err on the side of caution, so I'll still do anything I can to help make the RIAA go away.