No, I'm citing a handful of examples of the shows with broad consensus as to their importance and quality to illustrate that the medium itself had not started its decline during the period you suggest. Just because you want to handwave critical acclaim since it refutes your conclusion doesn't mean that anyone else is obligated to follow suit. Even if I assume that there are always good or perhaps great shows on cable for the sake of argument, there certainly aren't always shows that push the medium forward in terms of craft and storytelling. Do you not see the absurdity of creating a topic to discuss when cable began its decline as a "medium of entertainment" if you are going to automatically dismiss discussion of the quality of the entertainment from that medium during the timeframe in question, except when it bolsters your point (read: discussion of increased reality television as a negative in the original post)? The same reasoning (there are always bad shows) applies to reality programming, anyway.You're basically saying two or three channels (HBO, FX) held up all cable channels. My point is there are *always* great shows on television so by this argument critical acclaim is basically out, and you can only use subscriber count, so cable's fall off started...what, a couple years ago?
I don't buy the wholly unsubstantiated timelines for your pitches about "optimizing" and network identity loss. Also, the notion that television networks, the first of which first began in 1939, hadn't started to optimize their programming for profitability until 65 years later is ludicrous on its face. Why do you think programming changes over the decades? Why do you think shows get cancelled? Incorporating a higher percentage of reality programming is not the genesis of optimization - it's another link in a multi-decade chain.
Here's a Wikipedia entry with 250 cites to articles about the golden age of television starting in the '00s:
Golden Age of Television (2000s–present) - Wikipedia
en.wikipedia.org
I'm not just making up stuff based on my feelings.
I'd suggest that's cable's relative decline as a medium of entertainment started somewhere in the mid-'10s as streaming services narrowed the gap between cable and its competitors with prestige programming of their own.