Matthew 17:10-13
And his disciples asked him, saying, Why then say the scribes that Elias must first come? And Jesus answered and said unto them, Elias truly shall first come, and restore all things. But I say unto you, That Elias is come already, and they knew him not, but have done unto him whatsoever they listed. Likewise shall also the Son of man suffer of them. Then the disciples understood that he spake unto them of John the Baptist.
Once again we Jesus talks about how John is the Messenger that is promised to come. He also says that he will restore all things. At this time, there was nothing to restore since Jesus was establishing his church.  That means John must come at a latter date to restore things to the truth. That day is today.