Wrong. Brokers are middlemen. The whole idea of Bitcoin is to get rid of these sharks.
I'll never understand why people use exchanges at all when localbitcoins (for example) will give you a more secure & better rate than all of them at a fraction of the cost & with no money grabbing middlemen involved. I've lost count of how many dodgy exchanges have been either hacked, stolen customers BTC or simply disappeared - they are a leftover disease of the corrupt banking industry & go against everything that Bitcoin is/was/supposed to be trying to put right.
Trust in Bitcoin only. Nothing else.
I understand what you are saying, but for the meantime until some point in the future when Bitcoin can truly stand on it's own two feet, we need the industry at least in the initial stages when purchasing Bitcoin as these purchases will be in Fiat. Until Bitcoin becomes the currency for everyone we will unfortunately need the banks.
As people become introduced to Bitcoin their experience should be one that inspires them to delve deeper into Bitcoin, if their first experience with minimal knowledge is searching online and being fooled by someone and they get scammed that's them done, "I tried Bitcoin but got scammed" and so on.
I agree with you Bitcoin is the way, but it will take time, probably a long time before we can fully wave goodbye to the bankers.