Nice try, but wolf marks have been pretty useless for the longest time.

How did I have a full set of Aiming Garo gear on day one of 3.5? Because there was nothing else to spend the 20K wolf marks I already had on.
How did I get the Nue Togi (the new Aiming body added in 4.0) right away during early access? Capped wolf marks and nothing else to spend it on.

Did I grind for those marks? Nope. I just played. And enjoyed PvP. I'm probably capped again right now and don't even realize it, both because I'm not doing it JUST for wolf marks or tomes, and because I actively like PvP.

Well before Garo/Stormblood, PvP already had an active, but small playerbase. AFKing was VERY minimal if it even happened at all (because who wants to do nothing and get kicked when you waited so long to get in), wolf marks weren't awarded in nearly as high amounts, tomes were available, yes, but almost every other PvE instance awarded more anyways, and the larger reason anyone played PvP content was because they actually liked PvP. Most players only actively hunt when there's a new incentive to be gained from it, but take that away, and people who love hunts will still be hunting. PvP would be no different, and we need to stop fearmongering the idea that it will die without XP awards.