Obviously, bitcoin does nothing to prevent banks from doing what they have always been doing.  A lot of clueless people think Bitcoin is a "libertarian solution" to life's economic woes (ironically, this last 9 years up to 2009 have been a classic example of how libertarian economic policy, e.g. deregulating everything, is a horrible idea resulting in speculative bubbles, just like bitcoin's current price is a speculative bubble).