If Enochian became a trait then I would honestly feel that BLM would become pretty brain dead. You'd just do your rotations as normal without having to worry about Eno dropping and only keeping up your Astral/Umbral status to switch between the elements, that's it, and then potentially getting a free Foul for doing nothing after 30secs. Eno like several other temporary buffs (like Dreadwyrm Trance, Hotshot, Straight Arrow etc) can effect your damage too much to be giving a free pass as a trait.

If you use Between the Lines, why would you need to rewrite your Leylines?