The Guru tradition came into existence on its own. A person does not become a Guru by earning a certificate. Who can have the authority to issue certificate to a Self-realized Spiritual Guru? Does the government certify? No. Thus, this question itself is irrelevant.

To one who is seeking spiritual enlightenment, a Spiritual Guru is indispensable. The Guru, his Guru (Parama-guru), and his Guru’s Guru (Parātpara-guru) are revered. Even to learn a trade, a Guru (an instructor) is required. To acquire worldly education, you need a teacher or a professor. The same principle is followed here. To a spiritual seeker, spiritual Guru is a must. A Guru is very necessary for the disciple to obtain spiritual knowledge, for him to remain at peace, and to benefit those who have made material progress but are lagging behind in spirituality. Not just in Kali Yuga, in any Yuga (eon), a Spiritual Guru is very essential.

(Q&A, USA, 29 Jul 2011)