Like basically everything else, TV shows have become clickbait. This means that the MOST money is to be made immediately upon release. Look at basically any series and you will see that interest (and therefore viewership, and therefore profit) is highest in the first episode, and then falls off a precipitous cliff after a few more. Maybe if it's a good show it will plateau, but that's not very likely anymore.
The thing is, people just have so much choice. In the 80s-90's, you had a few options of TV shows to watch and that was IT. But now you have hundreds, plus anything on subscription services, backlogs of shows on netflix, whatever you want pirated as torrents or cracked subscription services. There is just NO WAY any TV show can maintain an audience after more than a few episodes.
So this results in a couple strategies: a subscription service that trickles in content one episode at a time for a "season" of like 5 episodes. Then they wait a year or so to build up hype, repeat. See this with Stranger Things and The Mandalorian. The other model is what I call a "pump and dump". When interest and the audience starts to tail off, immediately and deliberately cut the production quality and writing of what is supposed to be a long-running show, so it gets canceled as quickly as possible. In essence: sabotage your own work so you can move on to the next one rather than dragging it out over years. If you're an /a/ fag, you might recognize this technique as what happened with The Promised Neverland season 2.
What this basically means is that media is trending to a situation where they are constantly chasing the audience's immediate dopamine high. Rather than a long satisfying meal consumed over hours, it's a shot of heroin that wears off after a few seconds. Followed by another, and another, and another. The idea that we will EVER get a long-running series that plays out over multiple years (and the associated growth/development and increasing production values and better writing) is laughable. Remind yourself that most Trek series (especially TNG) took a few seasons to shake off the cringe and develop their own unique voice. That'll never happen again. A series that will actually reach a full conclusion before being "canceled" will never
We're not the studios' long-term lovers anymore. We're a whore that is meant to be used once and then left behind. After all, there are always new whores to convince to click once, JUST ONCE, and they make their money back and then some.