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?