I think it will be really hard to predict how wide ranging this case will go. The investigation is driven by Suffolk County, NY (where so many of the bodies were found) and includes multiple agencies. Would not other counties and jurisdictions be responsible for launching their own investigations of any unsolved crimes in their areas?
I'm not sure what it might take for an investigation of this size to launch in South Carolina, nor who would pay for it.
I think LE in Atlantic City would have to make the call whether to take another look or if they already have and said "not our guy."
What tugs at my mind is John Bittrolff, still protesting his innocence but convicted of two murders in 2014, using DNA, then cutting edge, but I suspect he was charged and convicted without the intense study of digital data that is available now and incredible valuable in this Gilgo case.
IF Newsday is right about Sandra Costilla being considered an RH victim, then will it come out that Bittrolff was convicted because his DNA proved he had sex with the two women, but as his attorney said, "proof of sex is not proof of murder." Apparently Bittrolff's DNA was not found on Costilla or he would have been charged there too.
I don't think LE will look at "solved" crimes, but wonder about the Innocence Foundation getting involved. I would hope that IF the taskforce did stumble into evidence that RH was responsible for Bittrolff's two, it would look into it for justice's sake. They should have enough evidence to solve a lot of mysteries.