He just fought Hopkins in his last fight before Mayorga, and got knocked out. Seems kind of pointless, no? Plus Hopkins went up in weight and DLH went down in weight. Add in the fact that Hopkins works with DLH on "Golden Boy Promotions" and yeah, you'll never get your wish of seeing that rematch.
Trinidad is a definite possibility though, simply because money talks and that's one of the main fights DLH wants. That Trinidad fight still haunts him to this day and you can bet he'd love to fix that before hanging up the gloves.
Ultimately, if he fights again you gotta think he's going after Mayweather though, and luckily as a fan I think that's the fight most of us wants to see anyway.