Seriously. They're taking down websites. If it was, like, eBay or Amazon or something, and 100% of business was conducted through their website, it would be meaningful. In this case, no business goes through the website, and it just seems like it would be an annoyance.
Also, unfortunately, a PR opportunity for the RIAA who can now point to the wild west of the internet and the fact that sites like Megaupload are supported by the most "dangerous" hackers in the world, the guys who took down the DOJ.