Although it also seems to be more of a cultural issue. There are already pretty good tools from companies like Perforce and Alienbrain, the problem is to convince the artists that there is value in using them. Every time I've suggested it, there has been imitiate pushback and outright rejection from the artists. Even in the places I've seen that use Perforce, most artists seem to see checking in and out as a pointless chore, rather than a vital and helpful part of their workflow
In that case it really doesn't benefit them at all and is a chore. You'll only get them to use version control if it's hard mandate (good luck) or figure out a way to make it completely transparent to them (something like Time Machine).