The Crime of Practising Philosophy without a License

I can understand that there are many professions for which licensing of some form is anywhere from absolutely necessary to exceptionally helpful, such as medicine or law, but do we really  need a system of licensing for say, philosophy, or literary theory? Honestly? While an employer is required to hire the best person for the position, and can be sued if they demonstrate a particular bias against a more qualified candidate, the rest of us may entertain any argument at all, from basically anyone, so long as that argument is ours to act upon if we so choose. There are still cases in which this may be less than advisable, but are we as a society prepared to forego useful contributions based on an inability or unwillingness to take on the obligations that a formal education entail, especially in light of how unnecessary such "licensing" actually is?