Board Thread:False Info and Speculative Discussion/@comment-190.27.43.13-20140708231921/@comment-24744701-20140711084351

Calixburn wrote: The Yukimura family is 2/3 supernatural. They won't leave because they can't. Beacon Hills is the beacon for the supernatural and now that the nemeton's charged beause of Allison, Scott and Stiles sacrifices, I think leaving permanently would be like a nail trying to free itself from a magnet. However likely, it's just my theory though. If Scott, Malia, Kira, Issac, Cora, Derek, and Peter can leave Beacon Hills at will, I'm pretty sure the Yukimura family can aswell.

The Nemeton attracts supernatural creatures like a beacon attracts whatever's looking for the beacon. It doesn't keep them from leaving the town. The only reason Cora came back and didn't permanently leave is because she was captured by the Alpha pack.