You couldnt be anymore wrong with Bozja and DR. Sure you cant rely on DF anymore for DR queuing but there's always and I mean...ALWAYS people needing to run Bozja for prog, character leveling, or farming for glam pieces and with DR being tied to ShB relics and Bozja this is something that you can reliably create a PF for and you'll get people willing to jump in with you. It may take a little while for sure but to call it dead is extremely stupid. I say this because I literally just right now on Coeurl hopped into Bozja wanting to level a job and there's people running around shouting for groups in Zadnor.
When there's unique rewards tied to a piece of content, people will find a way to still do it, and thats's seriously the only problem we have with Variant/Criterion dungeons and I bet the devs are already working on introducing more lasting rewards to have this content be reliable for people to create groups for.