It has been recently announced that Louisiana, New York and two other states will no longer be able to board domestic flights or enter Federal establishments with just a drivers license.
As I have long advocated every US citizen that plans to do any sort of traveling should obtain a valid passport and keep it updated. I'm certain it won't be long before even the cruiselines will be asking for them even for roundtrip US voyages since there has been several instances where an accident took place in a foreign port or foreign waters and passengers had to be flown back. It may be a case of you falling ill. You never know. This also applies to children.
It is better to be safe than sorry. Having that passport means not having to locate a US Embassy to obtain new documentation which could mean hours delay and could also mean the difference between life and death in some cases.
GET THAT PASSPORT NOW! IT COULD SAVE YOU A HEADACHE LATER.