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Sat Sang means association with Sat or Reality. One who knows or has realized Sat is also regarded as Sat. Such association is absolutely necessary for all. 

Sankara has said, 

“In all the three worlds there is no boat like sat sang to carry one safely across the ocean of births and deaths.”

Guru not being physical, His contact will continue after His form vanishes. If one Jnani exists in the world, His influence 

will be felt by or benefit all people in the world, and not simply His immediate disciples. 

As described in Vedanta Chudamani, 

all the people in the world can be put under four categories: 

The Guru’s disciples, bhaktas, those who are indifferent to Him and those who are hostile to Him. All these will be benefited 

by the existence of the Jnani - each in his own way and to various degrees.

- GEMS from Bhagvan Sri Ramana Maharshi