I think the DR changes was a side effect of them removing a lot of the survivability tools in a lot of each jobs toolkits. I personally think they could revert this by adding a lot more DR tools for each class and could easily revert back to DR similar to before. Granted if they add new abilities to jobs this probably bleeds over into the PvP design across the entire game and since I don't think they would just give people new abilities specifically for FL only, but I personally would be fine with that tbh.