Board Thread:General Discussion/@comment-26854333-20151007013907/@comment-10771297-20151026200109

7339man wrote: 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.
 * http://gravityfalls.wikia.com/wiki/Thread:134166#63

Touch é but we don't know what he'll do after growing up...

If you're implying that he'll go back to Gravity Falls. I highly doubt it.