The Spirit of Antichrist is here and working on the hearts and minds of the lost to accept and promote this. Everything that is written in the Word of God will come to pass.
Revelation 14:9-12:
"Then a third angel followed them, saying with a loud voice, "If anyone worships the beast and his image, and receives his mark on his forehead or on his hand, he himself shall also drink of the wine of the wrath of God, which is poured out full strength into the cup of His indignation. He shall be tormented with fire and brimstone in the presence of the holy angels and in the presence of the Lamb. And the smoke of their torment ascends forever and ever; and they have no rest day or night, who worship the beast and his image, and whoever receives the mark of his name."
Here is the patience of the saints; here are those who keep the commandments of God and the faith of Jesus."
The Final Countdown series offered some pragmatc possibilities as to why people would be chipped (marked) in right hand or forehead. Until you see these technologies, the definitive statement in Revelation about it being right hand or forehead seems arbitrary.