Adolf Hitler and Raj Patel come to mind as having had that finger pointed at them, and frankly, in 2008 I suspected Obama as being the one. All of them are at least symptoms of the growing culture of ‘antichristism’, but I don’t think the text in Revelation points to a person as much as an “ism”. The bible teaches that God uses both righteous and evil men to achieve His will. No position of power is received by any man unless God permits it. It is all part of His plan, perfecting humanity so that as many will come to Him of their own free will as possible.
Anyway, back to the Revelation… If we look at the images (and numbers) in Revelation as symbolic rather than literal, some compelling patterns emerge. Considering the political and cultural climate in John’s time, much of his message was necessarily highly symbolic. The churches would have understood the symbolism, much of it based on Old Testament references, while the powers that held him captive on Patmos would not.