The skirmish for control of the living room screen is turning increasingly bitter, especially when it comes to operating systems. By 2030, the smart TV and connected TV OS market will sprawl a fragmented 4.2 billion installed base of devices, but the sheen of growth quickly wears off when the regional divides, failed experiments, and sharp hardware shifts come into focus. This is according to the latest Smart TV and Connected TV Device OS Forecast from our sister service Rethink TV. At a CAGR of 9.6%, the combined base of smart TVs and external connected TV devices is booming—for now. However, the forecast warns that CTV dongles and streaming sticks are dying, with external devices set to peak and then…