What annoys me about this discussion is that Blizzard puts it as if it would take all the fun and choices out of talents.
But didn't they say that the new talent tree design allows for so much better customization. This would mean that even with triple spec we shouldn't have covered everything.
I don't really see how choosing talents is an awesome part of the game. It's not like we can only keep 2 pieces of chestpieces in our bags or have 2 sets in our equipment manager. Just allow us to create as many talents set as we need and allow us to switch as we like (by the current change dual spec rules of course). The fun and interesting choice will be to pick the right talent set for the right situation, not having to avoid all those aspects of the game that I couldn't make my spec fit for - or having to respec constantly. Missing out content or respeccing constantly (having to change glyphs, update action bars etc) doesn't sound fun to me, sorry :/