What worries me about a total ban is that the industry has always been made up of very clever people. I have colleagues at Health Canada who would say that, even if we ban sugar or caffeine, people in the industry would find other substances to mask the taste of alcohol. So we would end up with the same problem.
I have to answer you as a scientist. I have been doing research on alcohol for 25 years. The main determinants of excessive consumption are affordability and physical access. I am inclined to say that this is where we need to take action. In my opinion, all these issues regarding sugar and caffeine are just distractions. Athéna Gervais was not found in a stream behind her school because of too much sugar or too much caffeine, but rather because she had close to 100 grams of alcohol in her blood. It is the alcohol that we need to address.