If an ostensibly expert navigator of darknet private file exchanges is capable of finding only about 25 people sharing an unverified file more than 24 hours after the book officially went on sale, I believe the analysis that WotC will draw from this is "We won."
Of course the file will appear on the casual pirate sites. But I hold in my hands a copy of Arcane Power, ordered for $20 from Amazon with standard shipping, delivered before any pirate PDF is available. Every potential customer like me, who wants to have the book within a day or two of its release, will be able to draw the conclusion that they can either get it for sure by laying down $20 or they can wait an indeterminate amount of time for an inferior scan to show up. This is in of itself an enormous win for WotC compared to the recent business, where it was actually _faster_ to get the pirate PDF than it was to hit the LGS or bookstore on the day of release.