They revolt if they know its happening. Even today Coke has lots of different recipes. A bottle is very different from a fountain machine at a restaurant for instance. And folks don't get out the torches and pitchforks.
> Maybe they [Kraft] worried too much. Even though the change was written on the box, nobody noticed or commented. That's how much people cared.
I agree with the comment I'm responding to; I think Kraft was completely correct to worry, for exactly the reason you state here.
It could be computerized pretty easily, it's just not.