I voted no as well.
This would give too many lost hours on balancing the new specs (Even if you say it's broken, it would be more broken then). As Blizzard says it so well, more tank specs doesn't mean more tanks. I would rather have them center around a 3rd specc offer, so an addition to Dual spec. And really, we had a long discussion on the forum about lack of identity. Don't wish too many to be the same as other speccs (Tanks = Tanks / unless other, completely new style)