They already did.
"The Revelation of Jesus Christ, which God game Him to show His servants-things which must shortly take place. And He sent and signified it by His angel to His servant John." Rev 1:1
"Blessed is he who reads and those who hear the words of this prophecy, and keep those things which are written in it; for the time is near." Rev 1:3
John had it delivered by an angel, and then wrote Revelation so we may hear it. An angel delivered the message, and a human proclaimed it. Why not continue to do so?
Read up on Rev 17 for Babylon, among other places which I can't remember at this moment. Perhaps someone else could help us here.
"He causes all, both small and great, rich and poor, free and slave, to receive a mark on their right hand or on their foreheads, and that no one may buy or sell except one who has the mark or the name of the beast, or the number of his name." Rev 13:16-17
Seems pretty clear to me. I don't think we've seen it yet though, but as long as we follow the guidelines, it won't be hard to identify when we do.
I have no doubt about that