Yeah I'd go with some sort of tournament like a Queen of the Ring to determine the number one contender as well. You might not even need to name beyond saying it's to determine who faces Nikki at Summerslam/Survivor Series as well. You could set it in motion by simply having Nikki cut a promo saying that she's beaten everyone there is to beat on the roster and that the new NXT girls are beneath her. Until someone proves that they're worthy of a match with her she's not fighting
That brings out Stephanie to say she agrees with her and so she's starting a number one contender tournament for the women's title with Natalya, Brie, Paige, Charlotte, Sascha, Tamina, Alicia, Naomi, Summer Rae, Becky, Emma, Cameron, Rosa Mendes, Layla, Lana and Bayley (if she can get back from injury). That way you get to showcase a roster feud like Lana v Summer Rae, an NXT feud like Bayley v Emma and you get some interesting matches. Spread them out over Smackdown, Raw and Main Event and you got some solid women's wrestling for the next few weeks.
Imagine brackets like:
Natalya v Naomi
Emma v Bayley
Sascha v Layla
Paige v Rosa Mendes
Becky v Cameron
Lana v Summer Rae
Charlotte v Brie
Alicia v Tamina
leading in to
Natalya v Emma
Charlotte v Alicia
Sascha v Lana
Paige v Becky
That's a very interesting final eight and I know I'd be interested to see who advances.