The real wacky stuff comes from the people who say it will end wars. The theory being the whole world will switch to Bitcoin and it will somehow prevent governments from spending money on war (I guess they can't use the Dark Wallet?).
The theory is that ending the power to tax and the power to inflate the money supply will greatly curtail the government's ability to wage war.
I'd like to end the power to tax - people who believe in a particular battle should fund it with their own resources, rather than picking their neighbor's pockets. It would have been great if, in 2002, an invasion of Iraq had to be paid for by the people who were convinced of the need, rather than by them plus everybody who disagreed.