If LISK is ever caught, I think it will be from DNA rather than tips or more killings. I think he's probably in his mid- 50's now and his circumstances- be they health, relationship, or residence related- prevent him from finding new victims.
He's likely on a guarded high, of sorts, meaning he's extremely pleased with and proud of the renewed interest in his crimes but is also worried that he may've left behind something that FBI investigators could tie to him, namely DNA. If he frequented the dump sites before, it's unlikely that he visits them now per public interest and the FBI's involvement. He may be tempted to act out in some manner but won't; he may even think about how BTK was caught and decide to remain dormant.
I'm willing to bet that no one in his life knows what he's done, not a soul; he may even think it's best to leave it alone and live off of memories lest he be caught.