I can also see Dreadwyrm Aether going away... I think it's a bad design to have a mechanic - especially one that is displayed in the job gauge - completely negated by a lv72 trait.
If it would stay as it is, the most elegant thing to do is to have that level 72 trait straightforward saying "You don't need Dreadwyrm Aether to summon Bahamut anymore" and taking that element out of the gauge.
