Yes, licensing regulations also serve a useful purpose. But having the details of those regulations determined by the guilds themselves (rather than external authorities) is a lousy way to achieve that purpose. Why do I have to visit a dentist to have my teeth cleaned, rather than a dental hygenist? Why can't registered nurses or nurse practitioners provide basic medical care except under the auspices of a doctor? Because the rules are set by groups that represent the doctors and dentists.

It's also worth remembering that plenty of indigent people in this country are effectively represented by 'that guy,' including in murder trials. Look at the cases of Calvin Burdine or George McFarland, both of whose court-appointed attorneys slept through their trials. Are those barriers really doing what you want them to do?