I feel this is a defacto consequence of the rise of the Internet. The current year™ Internet created this ecosystem where you have an entire generation of content creators built on the backs of speculating about new shows, movies, or games, and the content in the upcoming iterations of them. It's what created the "and get excited for next product" part of that one RedLetterMedia meme, and why post-credits scenes in movies are as popular as they are post-Marvel. Basically, the company makes the product, social media talks about the product, and YouTubers speculate about the product which generates even more buzz around it. Rinse and repeat until the series finale or if the show jumps the shark.
I certainty would like a few more shows that stay self-contained and don't do much in the way of over-arching plots, but then that would just upset the content pipeline, and eventually drive certain kinds of people insane.
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