I don't know why you think it should end... I mean I do as far as the story telling goes. The last issue felt like I was reading a story a five year old wrote. But they could just get another another writer on it. Or just give it to Bendis. Most of the characters in that book he created. Ultimate Kitty's the only one he didn't create. But he's wrote for her before.
It doesn't look like anyone cares about this team configuration. Maybe no one cares about the characters either. But it's pointless to keep a book going that no one cares about.
It's not like there is a huge outcry over the direction of the writing.