#2 Brie Bella turns on Nikki Bella
Nikki Bella turned on her twin sister Brie Bella when the latter was fighting WWE's Chief Brand Officer Stephanie McMahon in a match at SummerSlam 2014. This started off a good feud, but was cut short due to poor writing.
In an attempt to even things up, Birdie Bee's mother could turn on her sister, and start a great feud. This wouldn't make them change characters, as Brie Bella could come on Raw and explain her actions. If the feud could be carried off well by the two wrestlers, the company should look at this option.
It would make more sense if Stephanie McMahon is involved in this storyline, as she was the major reason why the match took place in 2014. While this feud would be a great one, the company must look at ways to ignite this one by making it more personal, including adding their family members or past experiences.