Could you provide a source for that please? I Googled "tibetan buddhism prophecies end of world 2012" and all I found was a humorous, but serious, debunking of the idea that any Buddhist prophecy indicates an end to the world in 2012. It is somewhat long and detailed but the following two paragraphs sum up the author's conclusion.
The good news is, a few pages down, the Kalachakra tantra is supposed to last at least another 150 years on earth, or longer. This is good. It also says that Rudracakrin, the future 25th Rigden king of Shambhala, is living in the south -- perhaps in Goa? Mysore? Boca Raton?I don't mean to make light of this prophecy. It definitely means something, many possible things, with regard to the world of facts (snang) and possibilities (srid). But as the first Kongtrul was known to say, prophecies are difficult to trust...they don't come true unless many conditions are fulfilled. So we don't need to let the world go to hell in a handbasket just yet.
(bolding is mine)
But nowhere did I say that "Buddhist prophecy indicates an end to the world in 2012."
In fact nowhere in my post did I mention that end of the world.
Look at my post again.