Not going to fix anything. People said a 2nd healer would fix issues but it certainly didn't. (Thaumaturge actually was a healer as well originally, along side nuker..think FFXI RDM/SCH.)

If they add a 3rd tank it's just a new DoW that few will play - Let's face it, most people rather do damage than tank/heal, this is why pretty much every new MMO threw out the class system and gave characters with no defining skills.