This fight will never happen. Dana, Rousey and Rousey's fans know Cyborg would absolute demolish her so they will keep finding excuses to avoid this fight.
And to be honest, as much as I want to see this fight I think it would be a terrible idea. Women's MMA is only where it's at because of how marketable Rousey is. If you had a champion who was light years ahead of everyone else, unattractive, speaks little English and has a history of PED use the average UFC fan would not be interested in WMMA.
My Favorite Fighters
1)Gray Maynard 2)Dan Henderson 3)Minotauro Nogueira 4)Wanderlei Silva 5)Roy Nelson 6)Tim Boetsch 7)Mark Hunt 8)Shogun Rua 9)Lyoto Machida 10) Connor McGregor