A dramatic shift in the split of SVoD versus broadcast is approaching in the coming years, driven by a concept few in the TV business seem to understand, that for every hour of SVoD content viewed, it represents one traditional TV hour lost from advertising. So dramatic in fact that ad-free SVoD hours watched in the US are forecast to surge from under 1 billion in 2018 to approximately 3 billion in 2023, to the detriment of ad-based TV which will fall from around 5 billion to 3 billion hours in the same time frame. These cautious findings come from another warts-and-all report from our research arm Rethink TV, releasing its SVoD forecast to 2023 this week, titled The rise…