User blog comment:AVP3/Final Episode of Adventure Time/Adventure Time Movie/@comment-1992701-20130807061048/@comment-1992701-20130808033740

And to answer your question, it's not implausible for Betty to be dead. As far as we know, she IS dead. But this show has a way of shocking you and I wouldn't be surprised if Betty was "preserved" by the same magic used to "preserve" Simon. They've already announced that there will be an episode explaining Betty's role in the series. So brace yourself. As for Ice King, maybe he will stay insane. I don't know. But from his video, he made it seem like Simon was only lost in his own mind, and not gone forever. So I think it's more than likely Simon will be able to return. Besides, the Ice King has a pretty miserable life. True Ice King fans would want Simon to break the curse, because he has a pretty sad existence, sub-consciously looking for his "princess", sad, lonely, and having no idea why. I think we'll have IK until the end of the series. Then we'll get Simon back.