Denise Darcy would've been a fun character to revive in the latter years of the show. It's likely she would've been out of prison by then.
Imagine if Denise returns to Oakdale with yet another ax to grind against Barbara who busted Denise's prison hustle. Then finds out that Hal died and he and Barbara didn't even stay together. Denise might have had an even bigger grudge against Barbara, thinking in her imagination that had Barbara never intervened, she might have had a chance to reconcile with Hal somehow. Of course, that would be delusional on Denise's part but with Denise sitting in prison stewing over lost love, lost opportunities and Barbara ratting her out to the higher ups at the penitentiary, reason would probably be the last thing on Denise's mind when it comes to Barbara.
Forget Iris Dumbrowski, I would've much rather have watched Denise try to get at Barbara Ryan.
Watching an episode from '86 when Lucinda offers Holden his stablemaster job back (after things fall apart for him and Tad Channing) and Holden promptly tells Lucinda that she can take her job, her $25 dollars raise and air-conditioned room in the servants' quarters and shove them. The look that Lucinda gives him as she chides him for speaking to her that way. Actually the entire scene, there was heat. Lucinda started out inspecting Holden's busted lip and the look she gave him was as if to say "...don't know why I've never had you..." Lucinda had quite the sex drive back then!