The deal is this: Avengers EMH is not actually doing that well on Disney XD, so after this second season airs, a whole new Avengers cartoon will begin, possibly connected to Ultimate Spider-Man. While CBM is quick to blame newly appointed Marvel TV head honcho Jeph Loeb -- .... -- it's not entirely his doing; Disney obviously wants a show with higher ratings, and feels that an Avengers cartoon should be doing better. I can't blame them for that.
I personally think Disney made a mistake putting the show on Sunday mornings. It should be on prime time. I also think canceling the show would be extremely dumb!
The Avengers Cartoon Is in Trouble, Loki Sought for Questioning - Topless Robot View blog reactions