Earlier quoted context omitted.
Bitcoin is as worthy as tulips, in terms of intrinsic value. (Of course the worth of paper currency is the same, still, the backing is stronger) What will happen when bitcoins are worth less than the cost to mine them is anyone's guess
Your traditional bank account balance is stored as 1's and 0's in a database somewhere. What is the intrinsic value of those bits? Now think of how much energy is "wasted" keeping all those accounts updated, the lights on at all the branch offices, etc.
> Now think of how much energy is "wasted" keeping all those accounts updated, the lights on at all the branch offices, etc.
You should do some research before making such uninformed assertion (also banks do more services than just transaction ledgering)