I think the end would be around when Netflix started taking off, there was TiVo and similar recorded live broadcast/cable TV devices before but it was around then that larger groups of people went from watching scheduled TV to anything on streaming whenever, that change in viewing habits removed a monoculture around scheduled TV going back to black and white TVs & also changed quality dropping projects, development teams with experience, innovations, etc that don’t maximize streaming metrics. The beginning was probably around when they moved from more unscripted reality gameshow and variety shows to scripted drama and sitcoms around the 60s.
I think the end would be around when Netflix started taking off, there was TiVo and similar recorded live broadcast/cable TV devices before but it was around then that larger groups of people went from watching scheduled TV to anything on streaming whenever, that change in viewing habits removed a monoculture around scheduled TV going back to black and white TVs & also changed quality dropping projects, development teams with experience, innovations, etc that don’t maximize streaming metrics. The beginning was probably around when they moved from more unscripted reality gameshow and variety shows to scripted drama and sitcoms around the 60s.