Complete Electronic Transaction

I was just wondering how it would affect us if all sort of money transaction was made electronic. We will not be carrying cash in the hand and all the shops would accept only card - debit or credit. No form of hard cash transaction would be possible. I think this will first and foremost bring out the black money as all transaction is going to be routed through banks and government can easily keep a tab on it. This would also prevent bribe in the form of cash to certain extend. This would make begging impossible. We no longer have to worry about soiled and torn notes. No problem of giving exact change. The advantage seems to be many!