While I think we’re all slightly grieving about the new PvE in WvW, I think we can all be slightly grateful that we haven’t heard “Scarlet’s minions attacking Stonemist” yet, so maybe this is just an attempt to combine WvW and PvE in a good way…
Now I’m not just playing the optimist, think about it a little: they added “finishing” to PvE and they added these toxic towers only to mercenary camps. They could easily be adding this as a way so that the PvE’ers don’t have to come to WvW (for Halloween achievement), and allowing WvW’ers to get the inconvenient mercenary achievements just a little faster (The Toxins kill the mercenaries lowering morale letting you come in and take it back).
Maybe…
“A conquered people will always resist you,
Edair. But allies-allies will fight by your side”~Cobiah Mariner