I'd rather they did as with DHs. Just 2 specs, mayb 3 for Druids. Wud make it better for balancing purposes and maybe remove the whole, this patch you play spec1, next patch spec2, next one spec3, back to spec2 and then spec1.
Survival has clearly not gone as planned and could easily be consolidated with either MM or BM both more flavourful. Why do DKs need 2 dps specs? Bcos lore says it? No. Same cud be said for Rogue, Warrior (They've never been able to balance Fury & Arms, EVER!), Warlock (Demo hasnt worked since Old PRE-Hellfire Citadel Demo). An argument could be made for consolidating Shadow and Discipline or merge Holy with Discipline to one, where talents define whether you'll be healing with shields & smite or with regular heals.
And with how the game is designed now, they cud merge Feral and Guardian as it once was, just making a talent decide whether you'll be a tank or damage dealer.
Overall I think less choices in specs but more choices via talents will make for more interesting gameplay and overall better for balancing purposes.