Board Thread:General Discussion/@comment-26854333-20151007013907/@comment-10771297-20151024221721

Can't happen because a while back Alex said that the twins are going back home after the summer. The apprentice thing is a passing phase.

I said this before, the only possible way for that to happen is if they did a series that takes place before the events of "Weirdmageddon."

Also this is almost identically the same conversion as this one.
 * http://gravityfalls.wikia.com/wiki/Thread:134166#63