Like alcohol or cigarettes there's no way they could ever be banned, but I think if society really pushed for it we could lump soda into the same category: Illegal to give to minors, warning labels, ID to purchase. The slippery slope argument is that people will argue that next comes targeting ice cream, pastries, etc.. while conveniently ignoring that drinking a soda with one or more meals a day is normalized yet eating a slide of pie at that rate would be alarming.

I doubt it will ever happen but it would probably help with our obesity rates among children.