Well, but it's not essentially to the plot that we know Hermione forced Rita. If they show the Quibbler in OotP, I can see the next screenwriter giving Hermione a brief line or two to all Ron and Harry on the train about how she forced her and that'll be all there is to it.

But I'm sure anything Rita related in the next one will be super brief because - well, just think of all the new characters introduced in OotP - Luna, Tonks, Shacklebolt, Umbridge, etc. And as we've already seen with GoF and it's slew of new characters that old characters get pushed to the wayside (Snape) to put the limelight on the new ones.