These middle men are the same people like us they have the same minds as we and these are the people from among us so they will also join our community and they will not remain jobless. If they will lose one opportunity then they will get many other opportunities which will be far more better than the previous one.
So don't worry for the decentralized era it will make us more stronger and independent in the financial world.
The decentralization that the blockchain technology has brought to us will not remove the jobs of the people in our era and it will create more jobs instead. We are now in the midst of transition towards a full technology based era and we need more people to support this transition so tech companies will hire more people and it will provide opportunities to those who are currently jobless.
And at that time the changes appear, where the jobs played by humans will be replaced by machines. But that does not mean people will be unemployed, but they will also follow these changes where they are forced to follow technological developments including their work.
If today humans work for sustainability, then humans in the future will work for innovation.