Trade associations and industry standards tend to function most effectively as tools to limit competition and as barriers to entry, rather than as tools to create and enforce professional standards.

Medical boards, bar associations, and professional unions are notorious for protecting even the most incompetent or outright criminal members. Stories of incompetent doctors still practicing after killing multiple patients, police who are still on the job after unjustified violent assaults or killings, and attorneys who have cost the freedom of innocent people with no consequences are so common that there is little outrage.

I doubt that IT needs a similar system to protect incompetent developers and DBAs.