Nemesis - No, the talent system does NOT mean every spec would be equal and you wouldn't need to swap specs. The SV and BM specs are OK... however if you want to do the best you can you'll likely swap back and forth.
Teh - which is why i said that they can fix the imbalance by moving mages and locks back too. Which they choose is likely more dependent on encounter tuning in 5.2. But we're not fine, we're just OK.
Let me put it this way... if you have equally an geared mage and hunter and you can bring either to a raid (I mean you, the player), the RL will probably prefer the mage to the hunter right presuming equal skill on the part of the player. If we were fine, the difference would be small enough that a RL wouldn't care.