Don't you hate it when people still beat on that very dead horse (heal all button) over and over again. It isn't going to make anyone in Inno change their minds.
It is obvious that the button is going to stay where it currently is. Especially after it has been here for over a month and a half. If you have a problem with spending diamond unwantedly, than turn on the spend diamond comfirmation button (simple as that).
If you don't turn it on, than stop WHINING about it.
(sorry for the rant) / (steps down from soapbox)
This is far from a closed deal. The CM has mentioned that it's in discussion and has some details, although he can't share.
It's possible that they're waiting to see if the change is going to "grow on us." If they reverted every change the second there was bad feedback, the game would be an unstable mess. (Message center changes come to mind. A lot of people didn't like them at first, and now those same players love it.)
This just happens to be a case where the problems are not going away. It's going to remain unpopular.
The cynic in me wonders if they already plan on changing it, but they are milking the accidental spending as much as possible before releasing the fix.
Continuing to push is how changes happen. If ppl gave up so quick, imagine how much worse the world would be right now.