[qqqwerty]

Bitcoin isn't replacing any of them, so it's a moot point. If someone wants to buy real estate using bitcoin they are still probably going to use a realtor (or at the very least a lawyer) and they still probably need a mortgage, title insurance, and home insurance. If a company wants to go public, there is still going to be an army of i-bankers involved, even in a bitcoin denominated world.

The banking sector exists for a reason. There are certainly parts of it that are superfluous and excessive, but someone somewhere is willingly paying for that excess, and that won't change under a bitcoin regime. And I personally think that most of the excess is due to excessive speculative activity in our financial system, and if anything, bitcoin seems like it will make that part worse.