I assume you are referring to the study conducted on 7 people. Granted they did do a survey that consisted of 400 people, but the direct research sample was very small. This was also a single paper. The results are interesting and should prompt more studies, but it should not be used as a basis to determine if artificial sweeteners are bad for you without a more comprehensive study.
The worst case scenario is that something that has been studied for decades on thousands of people is replaced with something that has not been studied as thoroughly and that is later to discovered to have bad effects. It's fad science.