It's the same as the US, if the shows is supposed to live or die by the ratings it's quickly and quietly cancelled (and is generally of higher quality).
If it's supposed to sell merchandizing it'll live as long as the merchandizing sell.
Guess why Green Lantern or whatever that was got cancelled?
I still don't get why wildly popular mangas that get successful anime adaptations (which is the norm btw, if you get a manga that is popular you usually get an anime after that....and a game too....and plenty of other stuffs) is the fault of otakus.
You're basically singling out stuffs like the show Transformers and saying otakus are the only ones making these shows viable.
That's so far from the truth it's comical.
The thing is the border into what is considered otaku culture is subjective.
Anime is an expensive habit, especially if you want to buy all the things they want to sell. You look at something like Dragon Ball Z, and you realized the lines are blurred. It is terribly written, but kids dont care about that. The issue comes when you have adults, 25, 30, sometimes 40+ who had the ability to keep up this habit. You know, of buying the awful video games, the clothing...ect, and the lowering of standards that followed.
No non Hentai animator dreams of making Moe type things. You just accept it because it puts the money in your pocket, and allows you to keep doing what you do. You supply a good that has come out of the damaged idol culture. It is a damaged psyche that keeps the money in the pockets of Anime creators, and they will ride that train forever. It really is simple to see if viewed through the Idol lens. Idols are imperfect. They grow up, get boyfriends, have a mind for themselves.....they let you down, and in turn remind you of the imperfections in your own life. These new idols wont though. They are created for you and live to serve you; the essence of the modern Otaku. Like in the past they will buy everything. They will be loyal, the perfect consumer. Its the lowest common denominator; the type of thinking that would allow a grown man to watch absolute rubbish written by Akira Toriyama, a guy who cant write his way out of a paper bag, and say "
Hm, this is fairly good"
These are completely different than the average kid in the early 90's, in pass, watching and enjoying something like DBZ on fuji(although I might be disappointed if he or she picked such a thing over a TPD special on TBS often airing during the same time) or even in passing getting some joy out of the manga.