Lordt, I hope it never happens.
I used to somewhat be open minded to the idea of Vixen and Bronze Tiger or Vixen and John Stewart happening again or happening in the comics.
But Bronze Tiger is the only comic romance Vixen has had and he made her look like a fool, the same with John Stewart ...outside of comics, in her only recognized medium and she was playing second fiddle to Shayera and getting dragged by shippers.
The writers, DC, and Vixen herself may not remember or care but I do, I'll hold the grudge for Vixen.
It's time for a complete fresh start for the character, she needs to shed eveything from DC's past work with her except her first appearance with Superman, JL run, her guest appearances with Animal Man, and her Rebirth one shot everything else should be a
for the character, with nothing rehashing or hinting to the past.