As it happened, the anonymous blogger wasn't "just a lawyer," he was Rick Frenkel, intellectual property counsel for Cisco. In the subsequent defamation suit filed (where else) in the Eastern District of Texas, the plaintiff's strategy highlighted the anonymity of the Troll Tracker, painting his actions as part of a sinister consipiracy by Cisco. As a result, Cisco changed its blogging policy to specify that:
If you comment on any aspect of the company’s business or any policy issue the company is involved in where you have responsibility for Cisco’s engagement, you must clearly identify yourself as a Cisco employee in your postings or blog site(s) and include a disclaimer that the views are your own and not those of Cisco. In addition, Cisco employees should not circulate postings that they know are written by other employees without informing the recipient that the source was within Cisco.
In short, while privacy per-se isn't a bad thing, it can be dangerous, and that danger is something that businesses need to be aware of as they go about their business.