As far as I can see, even with the PL option, there are regulars parties being formed without any problems. You are assuming this will go to the extent where there are no regular parties formed. Like everything in an MMO, everything can be adjusted. I am sure if it comes to that, SE will adjust the PL issue. Up until now, it is not, so let it be if its not affecting you. I am of the mindset that if I have the time, I would rather do grind parties or anything fun to level up. It is rather boring to receive and to give PL but I am glad the option is there if I'm up for it one day for myself or friends.

This thread is like every other doom thread and I predict that like every other doom thread we freak out times rolls on, nothing happens. Everyone wants the game to succeed, but we need to let the Dev Team do their job, in most cases they can foresee unwanted outcomes better than players.