I'm still confused about the actual issue.

From what I've read, the only change to Warden is it now encrypts the data it sends to Blizzard. Nothing about running new malicious code, about opening holes in your system to allow malicious programs in, just encrypting outbound data.

1. We already run Blizzard software. We trust their executables. Every time a patch comes out, we run a new file that we know is going to modify files on our system. In fact, we have to run it as an administrator to do so. I see no threads saying "OMG, we should be able to patch as a guest user to safeguard our privacy!"
2. As someone else stated, Blizzard already has our credit card information, address, email, full name, etc. What exactly are you worried they're going to "steal?"
3. Rootkit? WTF? A rootkit is fundamentally different than Warden. A rootkit prevents you from uninstalling it. Warden only runs when you have WoW open. Rootkits try to take over your computer. Warden doesn't.

I have no doubt that the encryption will be broken quickly, and people will see what data was being sent. Blizzard will then just change their encryption to try to keep a couple steps ahead. If people actually find objectionable data being sent then I can see a cause for concern.