The worst thing about this is the lack of control.

What if one of my accounts gets hacked and the hackers post with it?

The only way I can see myself being ok with this is:

1. I never post on the WoW Forums ever again.

2. Blizzard enables some feature that permanently and irreversably disables posting from any of my accounts.

3. Blizzard provides a system for obtaining technical support that works better than reply-bot email service, or an international phone call.