D&C 65

 In my mind, the Lord clarifies the condition that must be satisfied for His second coming, saying - 

"Wherefore, may the kingdom of God go forth, that the kingdom of heaven may come, that thou, O God, mayest be glorified in heaven so on earth, that thine enemies may be subdued..."  (Doctrine and Covenants 65:6)

His second coming will take place dependent upon how the kingdom of God goes forth.  Not upon the wickedness of the world.   Elder James E. Talmage taught - 

"We are praying for the Kingdom of Heaven to come, and are endeavoring to prepare the earth for its coming. The Kingdom of God, already set up upon the earth, does not aspire to temporal domination among the nations. It seeks not to overthrow any existing forms of government; it does not profess to exercise control in matters that pertain to the governments of the earth, except by teaching correct principles and trying to get men to live according to the principles of true government, before the Kingdom of Heaven shall come and be established upon the earth with a King at the head. But when He comes, He shall rule and reign, for it is His right.” (In Conference Report, April 1916, pages 128-29.)