Revelation 13:18: Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.
Here is a link to an article discussing how the number 666 relates to Papal Rome and the identity of Antichrist:
Another post from the same source alluding to 2015 can be found here: http://www.reformation.org/damballah.html
This article gives a fairly traditional historicist interpretation of Revelation 13.
Interestingly, many historicists seem to link the downfall of Antichrist with the second decade of the 21st century. This has to do with Revelation 11 and the 1260 years of Antichrist’s reign. This article fingers the year 2015, stating:
Many of the commentators on the Book of Revelation, such as Adam Clarke and Baptist pastor John Dowling, predicted that 2015 would be a milestone in the demise of the Papacy. Here is a quote from his book written in 1840:
If, according to Adam Clarke, in 755, when the temporal sovereignty of the popes was firmly established, then they will end in 175 years, or 2015. (Dowling, An Exposition of the Prophecies, p. 191).
Based on this prediction, time is running out for the Papal dynasty.
Time will tell if this time calculation is correct, although it does not appear that the author took into consideration the changes from the ancient Roman calendar to the Gregorian calendar we use today. Some commentators arrive at different dates when the calendar conversion is taken into account.
In any case, the Bible tells us what will happen when Antichrist falls:
Revelation 16:17-21: And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done. And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great. And the great city was divided into three parts, and the cities of the nations fell: and great Babylon came in remembrance before God, to give unto her the cup of the wine of the fierceness of his wrath. And every island fled away, and the mountains were not found. And there fell upon men a great hail out of heaven, every stone about the weight of a talent: and men blasphemed God because of the plague of the hail; for the plague thereof was exceeding great.
These are definitely very interesting times we live in!