I'm assuming they're going to have Tamina turn on her and win the belt, for some reason I just don't see it going any other way at this point.
I agree. And if it happens at WMXXX (which it should since AJ will be the longest reigning Diva's Champion by then and it'll feel most epic having her long reign come to an end on the grandest show), then there's the connection of Tamina's father being apart of the first ever Wrestlemania main event and now exactly three decades later his daughter wins the Diva's Championship. Not a BIG full circle moment, I know, but something I could see Tamina mentioning in a promo at the event. This year's Mania is gonna largely be about referencing the history of the event (especially the original), so that type of connection to the past can't hurt. Same goes with Orton probably mentioning his dad being apart of the original WM main event as well and how three decades later he's defending the world title there as the unified world champion.
Then again, with Emma possibly coming to the main roster, she may be the chosen one to end AJ's reign instead.