Nikki Bella and John Cena are WWE’s Power couple right now, so it is interesting that in the current era where there seems to be a lot of WWE couples, WWE is not taking advantage of the coupling and putting them together on WWE TV. 
Renee Young and Dean Ambrose were the latest couple to be revealed on WWE TV and they now join real life couples like Rusev and Lana, Miz and Maryse and Naomi and Jimmy Uso who are all working together on WWE TV.
It is worth noting that both Carmella and Natalya have mentioned Cena in many of their promos when dealing with Nikki over the past few months and it is thought that this could be a nod to the former World Champion to work with his girlfriend on-screen down the line. 

Nikki and John have been at the forefront of storylines on Total Bellas and Total Divas so this would be another way for WWE to give fans what they want and allow the couple to work together as well.