Resolution isn’t the only reason to adopt a 4K Ultra High Definition TV. Costs are coming down and the TVs offer plenty of other technological tweaks.
The first track might be a cinematic track that would support “optimized-for-4K” HD encoding and provide a pathway to true 4K content at 24 and 30 frames per second.
A second track might be more attractive to sports programmers.
Finally, a third track could be attractive to all service providers as it uses the enhanced efficiency of HEVC to deliver traditional HD services while freeing up bandwidth for UHD and data services.