What are the best long running anime

Why is it so rare to see new, long-running anime series these days?

In addition to what Arcane said in their answer, I think there is one more important factor:

Many anime shows are based on manga that may or may not even be built for a long series. Some of the things published as manga just weren't designed to be an open world for story exploration.

For example, think of The Green Mile by Stephen King (I know not a manga, but go here with me). It is a more wonderful Novel that was originally published as a series. I mention this because it was a series novel, but it wasn't a long-running series novel - which is similar to a lot of manga. Each piece in the series plays its part, but it definitely comes to an end, and that's it. There's no room to tell the story of Expand The Green Mile . The author told the story he wanted and there is nothing more to tell. If they continued to produce "episodes" of the series that talk about other prisoners or other events in the same prison, I think that would somehow reduce the story told in the "original".

(Side note: if you're using the movie for The Green Mile but haven't read the book, I can't recommend it enough. It is by far one of my favorite books / films of all time.)

Some mangas are like this - they have a story to tell, they tell it, and then it's done. There is no more. things like Death Note come to mind in this regard. The manga series has ended and the story has been told. I don't know the chronology of the releases for movies, TV episodes, and manga, but at this point it's all "done". It's a good read and story, but I think it would diminish if they tried to put out episodes that fit the universe just to make episodes.

Some shows are great for regular, regular episodes. Others simply tell a story, and when the story ends there is no choice but to move on. In fact, I kind of hate it when they "test the water," as Arcane mentions, and season 1 ends on a cliffhanger because they saw if season 2 was going to be a thing. Then you get a story that is left unfinished and you may not get the ending at all (from the show or written material). If there's one thing I hate about a story, it's an unfinished story.

Imagine a show like that Breaking Bad would only continued until the audience falls below a certain threshold, and then the next season won't come out just because it's not approved by the network. That would dreadful and the end that Breaking Bad was one of the best television programs I'd seen in years. Sometimes it is best for the show, series, and audience to get that complete resolution for everything.

To bring all of this back to your question, I think part of what you see is a lot more writers trying to tell a particular story and doing it well enough to get really popular, but then that's that Story done. Nowadays there is one quantity Manga, so the market is saturated with really great things to read / watch. When a long running series gets underway, the problems Arcane mentioned are resolved. So what we consider "successful" is the short / limited run series, which may only run for 13-25 episodes, but is coming to a close and the audience is happy. And we consider an attempt to be long-term a "failure" if it doesn't go beyond the first or second season, even though the episode count is the same as that of the short / limited series.

And there are only so many hours in a day that at some point there will be conflict, as many people can see. If we're all watching a really high quality anime that's 1-2 seasons long, we just don't have time for those 5+ seasons. Perhaps there are such series that have not yet caught your attention, or if you do a Had seen such a series, you would think it was "too childish" and say goodbye to it.

Small note too Attack on Titan : There are more episodes to come, but there seems to be a long cycle similar to that of Rick and Morty . Maybe with continued support and revenue they can hire more people to speed things up, but that's more of an issue with their business / development cycle than the content. You could have a super great business idea that will make you billions and let your descendants live in luxury for generations to come, but it doesn't mean crouching if you can't get it to market. Unfortunately, there are likely many great untold stories out there that fall into this category for one reason or another.

Torisuda

This is a good point too: most anime these days come from manga and light novels, and not all manga and light novels are structured in such a way that the story can continue for twenty years. Drama and Romance in particular: You can keep an action series going by throwing stronger and stronger villains at the characters, but dragging the romantic tension for too long when the whole base of the story just becomes a nuisance.

Arcane

I think although you have given many relevant examples. This is covered in point 1 ... "There aren't just so many popular series out there that can be customized for hundreds of episodes."