Honestly I'm sure,while it's been on a for a couple years I don't see it ending any time soon and it's hard to assume because there's so many things that could be done with the Zeigen and the only thing that I can say is I know it won't be ending soon.
I don't know but it shouldn't be ending any time soon ^^ plus Du have other new shows coming out this Monat Steven Universe , Teen Titans Go! , The new Power Puff Girls Zeigen Special , Uncle Grandpa , Grojband , Beware of Batman , Clarence for CN This Jahr so it shouldn't be ending right now :D but what if it was on going like Spongebob.
Never say that! Adventure Time can't end....hahahaha it's pretty beliebt since Fye and Hot Topic still sell their merchandise, so I wouldn't say anytime this year. Maybe it'll be like SpongeBob which is still on even tho it started in the 90's...
AT can't end since CN Studios is gaining a lot of money from merchandise, as well as the Zeigen itself. Look at some of the other shows they have that has survived over the average life span of a cartoon. Ben Ten is one. And AT is the no.1 cartoon right now from what I've seen on other websites. Many people watch AT Mehr than other CN shows. It doesn't make any sense if they end AT cause many and I mean MANY people watch it. They even target a large audience, the age ranging from around 6-15 on average.
So yeah that's basically why it's going to be on for a long time.
I honestly think it will end when Cartoon network has enough money. Like other channels, they all have their cash cow. Like nick has Spongebob, Disney Channel has Good Luck Charlie. And Cartoon Network has Adventure time.