usually when nerfs come they are as effective as the team wanted them to be, so if a class dies because of nerfs that's kinda what the team spects sometimes when nerfing cards, like the mana ramp nerfs on druid.I really wish the team wasn't so chickenshit about nerfing and unnerfing cards, and this wouldn't be a problem. Like they could nerf Boom and if Warrior dies because of it, then revert it or find a better middle ground. I'd love to know the reasoning behind not reverting changes to help classes that are in the dumpster or only have one archetype. Like before rotation when Shaman wasn't even being played, why not put Flametongue totem back to 2 and then nerf it back to 3 once the expansion comes out.
I'm not gonna pretend to know how much work they do and what it takes to change code and whatever else in this game, but I'd really like an answer at some point. In my opinion, there's no reason you can't just make changes at will to the cards, it's digital. The only reason I can think of is the tournament scene.
And I don't mean anything absurd like changing cards every 2 weeks or something, I mean when everything is mostly settled and it's been like a month and a half and it's pretty clear that a class is going nowhere or only has one deck to play.
They also have a pretty good track record of nerfing the correct cards to make the problematic situation go away. I don'r think they nerfed a card to address a problematic situation on the game and the problem still persisted... may be quest rogue, but that really resulted like the cockroach of the game.