[sgnelson]

If nothing else, it requires a computer and a network connection. Yes that may be just a smartphone of some type, but that's something that paper currencies do not require to use. If nothing else, that leaves what, a billionish people* out of Bitcoin?

It certainly is much more elitist than typical currencies if it requires a certain level of capital and knowledge to use.

*Scientific Wild Ass Guess on amount of people in the world lacking a device capable of dealing with bitcoins.