This will be the demise of any and every online community. If you are horrid cunts to those who try to join, you will die a slow, painful, miserable death - and you deserve to. The very few times I have tried to add anything to wikipedia, they have been quickly removed with a non-substantial reasons for removal. They mostly seem to be "you're noob - gtfo" more than "revise to make it more X or Y. Great job on Z."
I'm not sure how one would ever spearhead such a change since their longterm volunteers are elitist and annoyed and they can't pay them to be non-elistist or less annoyed. Further, they can't "hire" new non-elistists because there is nothing to offer them to make up for noob treatment.
I am all for communities having levels of entry and ways to keep newcomers from completely fucking up the balance. But there has to be a path to success for any noobs. Otherwise you will end up with fewer and fewer people and this ever-shrinking group will become more tightknit than ever and block out more and more noobs. This will cycle endlessly until there is nothing left.