Just like any new job there will be a large rush for players to play it. Just like any new content. And just like after the initial rush people will move on to something else, the bad players will be weeded it out. Hell, just keep an eye on the NIN wave that will happen next week.

As for people assuming to play DRK as a DPS as they level, the moment they hit any sort of party content they'll have a rude awakening as they are required to fill the tank position in the party. As if leveling up with a party and unlocking skills won't be any indication that, "hey this skill has enimity attached to it...and this one...and this one". And just like any other job played in the party, people seem to have zero problem just kicking a bad player. So, I don't see anything changing at all.

This isn't going to be an isolated problem to DRK. It's already happening to other jobs.