There are 95,000 physical bank branches in the US and 500,000 employees at the 3 biggest banks alone.
Of course bitcoin doesn't do everything those banks do yet, but on a per-transaction basis it uses orders of magnitude less resources than the current system
Do you want a human face in person to deal give you permission to use your own money (from 9 to 5 with an hour for lunch) or do you just want to be able to use your own money electronically without having to hand it over to someone first?
Of course bitcoin doesn't do everything those banks do yet, but on a per-transaction basis it uses orders of magnitude less resources than the current system