Cash is needed for spontaneous purchases. Bitcoins can be used as cash... especially online.
YOU CAN PURCHASE ANYTHING FROM ANY ONLINE RETAILER WITH BITSPEND... read their front page!!
French Company Paymium is working on Bitcoin creditcard and Kim Dotcom wants in:
There already exists a bitcoin ATM: Here is Jeffrey Tucker's experience:
Bitcoins are not dependent on electricity. Because you can store your bitcoin wallet in the Cloud; encrypted... dude there is even this thing called a brain wallet (which) Im not going to get into right here. http://electrum.org/ offers such a service if you're interested.
Bitcoins are so well developed that they don't even need the Internet... That is for some other day!
"We’ve moved beyond the Mises textbook. We’re running in the open market." - Erik Voorhees