#1 Because Becky Lynch is organically turning face
Yes, we may be in for a double turn very soon indeed. Let's assume for a while that WWE decides to listen to its fans and make Becky Lynch a babyface. Whom can she feud with on SmackDown Live, as a face character? Carmella? The IIconics? Mandy Rose?
The fact of the matter is that Becky needs to feud against Charlotte Flair because she's the only real, believable opponent right now. Asuka has lost too much of her sheen and is currently a babyface. The same can be said for Naomi, who isn't the Naomi of old.
So, in my mind, a double turn could be in the works. And Becky Lynch and Charlotte Flair could exchange roles during their exceptional Evolution rematch, whenever it happens.
Why do you think Becky Lynch went heel?