Players killing other players with guns = player-to-player interaction = good.
You have to take into account that some of us are instantly weary when we see mention of new POB stuff. So far, they messed up a whole lot of stuff (for some of us), and staff has been super-slow in finding fixes - some of which clearly haven't been found yet. And also the community is clearly divided: Some experience POB as 24/7 grief-machines, where others see absolutely no problems whatsoever. That makes fixes (as well as new additions) quite difficult.
If POB's were a nicely balanced product that didn't harm interactions between players in their current form, I reckon people wouldn't flinch when they see mention of new POB stuff.
tl;dr: Find solutions to the largest problems current POB's entail before adding new stuff.