In Fizzbang’s case, you don’t need to wait for a client-side fix since that’s not the limiting factor.
There’s only one valid reason I can think of to delay, and the fact that you didn’t bring it up–this one would have been disclosable–tells me it is not in play. Therefore there is no reason Fizzbang can’t be fixed.
If she could be given such a sweeping change in the middle of the week last week, it makes not one lick of sense that she couldn’t be given the correct change today.
Again, I understand that typically, the designers want to see how any change, including a new troop, shakes out before taking action. Well, this one has shaken out. Fizzbang was introduced and was very fun, then three days later because she was overpowered, you guys yanked the rug out with a very bad fix rather than nerf her in a way that stayed true to the spirit of the character and kept her fun.
I don’t think you guys have properly understood that players care about this issue. For proof as to how much, look at the views on this topic and compare it to the 3.1 known issues topic, and then to other posts in official news. This issue is a very big deal. You took a fun event and made it painful halfway through the week, and a lot of us are good and angry over it. That anger isn’t going to go away just because you wish it would.