R. C. Sproul died on December 14 2017. When you look at lists of the great teachers of our day they will almost always include R. C. Sproul.
On February 21, 2018 Billy Graham died. It is estimated that he preached the gospel to 215 million people.
Warren Wiersbe died on May 2 2019. He was prolific writer.
Who will take these saints places? Who is willing to submit themselves to the God of the universe to be His instruments? God is calling us to be faithful servants.