Board Thread:General Discussion/@comment-26854333-20151007013907/@comment-27738735-20151025000628

Topdarlingwh wrote: 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. Here's the thing though, as a writer I say lots of things will or won't happen, then I go back on it since I changed my mind to make it better  or whatever.
 * http://gravityfalls.wikia.com/wiki/Thread:134166#63