I really wish Deviantart would add drawing boards for people to work together on..I'm pretty sure everyone would love it, considering the user base, plus it would increase the daily activity here as well.
There are PLENTY of ways to discourage trolls from having access. Artists could also have their own private drawing board on their page to allow trusted fans and friends to draw with them, or we could public boards accessible only to accounts that are of a certain age, maybe give access 1 month after joining. . It's not like we can't get a little creative, rather than just leaving up a completely free access board for anyone to use.