No, they have not. I've posted the numbers on this before. It was Matt Fraction's lackluster effort on the title that killed the audience that Hickman built up. Sure it was a stunt issue but the sales for the "death bag" issue were pretty high. Hickman's numbers averaged in the 40,000 range. For a while, the FF title tooks its place but sales on both titles were strong enough under Hickman so that you essentially could say the Fantastic Four was double shipping for a while because the storylines overlapped.
By the time Fraction's run ended it was near the bottom of the top 100. That has never happened in it's entire run.