Well, I won't pretend I know more then the average gent here about economics, but I do know Animation. And I know that if every modeler-texturer-concept/lighting/storyboard artist etc also could animate as well as me, well I would have a really good time finding work! Much like that industry, I think MMOs should encourage specialization mastery and teamwork towards greater goals that one should not be able to accomplish alone.

Also, XI had a limit system on crafts and it seemed to work out well enough. I would think that the devs in charge of its implementation knew at least a thing or two about MMO economics.