You wait. Management will play this one to the max.
They will go all out to portray themselves as defenders of the flt attendants.
It wouldn't surprise me to see them cause some sort of delay in the implementation.
This is an easy, no-cost battle they can fight on behalf of the stews to show them they don't really need a union. Absolutely perfect opportunity to be benevolent. Delta management standing shoulder to shoulder along side the oppressed FAs for truth, justice and the American way.

"Trust us, girls. We've got your back. Who needs that useless, expensive AFA."