I do think Iggy Azalea is capable of having hit songs without Pop singers on the chorus. #1 "Work" is one of her best songs of all time. She owns that 2nd verse. #2 "Fuck Love" #3 "Goddess" #4 "Change Your Life" and we can even add #5 "100" which had an R&B group singing the chorus on it. Oh and #6 "Trouble" featured JHud and R&B female on the chorus.

So its possible she doesn't need always a pop female on the chorus. It could be a great re-introduction tactic though.