I don't know, maybe I got used to it real quick. When the new (and better :P) coke zero came out people didn't shut up about it, so would be strange if they changed pepsi and almost nobody noticed. But I did have that happen with beer though, a beer I liked started tasting real bad, then I had it for the first time in 10 years or more last summer and it was good again. Think tastebuds works in mysterious ways and changes a lot more than we think.
- sometimes a brewery changes the taster/mixer master
- other times I suspect they start cheaping on ingredients
- in one particular case I almost expect the brewery did it on purpose: A particular brewery here in Norway produced a very tasty low-alcoholic beer that was sold durt cheap in one particular chain 8f grocery stores. Then at some point around 2008-2009 that particular beer changed to taste like the smell of a fox farm (I grew up next to one so I know that smell). I checked back a number of times but the quality didn't recover until years later. One possible explanation would be that they had an extremely bad deal and was actively sabotaging this product to sell less of it at loss.