Once they learn how, coach them and monitor their progress. Recruiting consultants need to influence HR to make this a highly measured and rewarded activity. They involve every employee in the searching and learning role. No recruiter can do it all. Make every employee a recruiter through a great employee referral program.
Recruiters are notorious for their independence.
Managers need to be continuous relationship-building recruiters and and recruiters need to become recruiting consultants and coaches. Managers will own and do all HR and HR will become productivity consultants, coaches, and trainers.