The Iconic Duo never really became that big in NXT. And it's not their fault... their rise occurred during Asukas title reign, where effectively the whole division was used to get her over. They could beat up Liz Morgan all they want, but other than that they were just fed to Asuka like everyone else.
That said, I do think the Iconic Duo have a chance at being built up. But that means beating Becky and Naiomi a lot, since again they're likely only going to job out Charlotte and Asuka selectively.
In a very small division, you can only push so many people at once. Charlotee and Asuke to one degree or another will always be pushed. And Carmella as the top heel champ will be pushed. But everyone else is likely going to at best get 50/50 booking.