Key bit of information that came from the interviews has been left out regarding the Endgame and Nuclear weapons. The nuclear weapons are not only a pvp aspect, but also have a pve use as well.
You see, there are these fissures, some form of opening that allows these large and troublesome monsters (level cap elites I would wager) to come rushing out causing mayhem. Use the nuke to close this fissure and the area becomes radiated and drastically changed. What that yields is a high risk, high reward, high challenge area that also is the only way to get most of your legendary's and the higher tier resources for crafting.
Its a revolving solution that should provide a minimal level of pvp incentive when the prospect of epic loot and new challenges arrive with closing a fissure. I dont know if this will do the same for nuking a player, but time and experience will tell.
I also dont know if there is another way to close said fissure aside from the very hard to acquire nuclear codes.