I wouldn't worry about the people spending all their time hunting and getting the skills that really at this point they are only going to use for griefing other players, more than half of them will be dead at some point.
These people will be annoying for awhile, but while they're out acting like the completely brainless grind machines they are, the more sensible people will be working on a village, or a mine and crops and anything else that will help them get the ball rolling. Soon enough the world will begin to balance its self out, rangers will start appearing again, and the idiots who murdered everyone in the beginning will quit after they lose their characters.