I hate to disappoint you, but there's not going to be a debate between Ms. Gillis and me. In fact, her study shows there's a link between sweetened beverages and obesity. As I pointed out during my presentation, a number of other studies have shown similar linkages. But the fact remains that an equal number of studies show absolutely no relationship between the two.
Targeting any one food and one solution is not the answer to the obesity issue. The answer is something much more comprehensive. Yes, look at caloric intake, but you should also look at nutritional education and physical activity.