Interesting thoughts. Increased privacy measures are definitely a good idea.
As for a privacy-oriented Hive, I'm afraid one of the drawbacks of that idea is that it would be impossible to do anything about reward pool abuse if all transactions done with the Active key were private. Making everything private would make no sense because this is a publishing platform.
You could encrypt everything and make your posts readable only to those in possession with right keys. But once one of those encryption keys leak, everything will be readable for all eternity because of the immutability of all Hive content.
The only way to completely cover your tracks on Hive is to use an anonymous account and a front end that communicates directly with the RPC nodes from an IP address that cannot be traced back to you.