The whole system is a dinosaur system. Eventually share registries, brokers, etc just need to die and all these assets need to be tokenized via crypto onto the blockchain with smart contracts. Huge efficiency gains to be made in this area (instant settlement, no paperwork, immutable proof of ownership, removal of custodial risk, etc). Unfortunately this whole process will likely take 20 years to be completed from now.
Even bigger cost savings and efficiency gains can be applied to the property industry.
In general the whole traditional financial infrastructure is riddled with rent seeking parasites and is massively inefficient. Why should it cost 5% just to convert from one currency to another? Why should it cost 10% to send money overseas (remittance payments)? Why should Credit Card companies charge up to 2%+ plus transaction fees (e.g. American Express). All of this pure rent seeking. There would be massive productivity gains in the economy if all these frictional rent seeking costs could be removed (or at least reduced). Crypto currencies and smart contracts will eventually do all of this but it will probably take another 20 - 30 years.