maybe retail financial services and all sorts of back office functions. But its not like Lazard has to worry about MergerCoin somehow taking away fees from advising CEOs and boards. Or JP Morgan should worry about ComplexMezzanineDebtCoin replacing its debt issuance fees.
Big financial institutions are big because there are certain advantages from scale. Neckbeard wet dreams notwithstanding I'm not sure I see a viable threat from blockchain tech
full disclosure i live for the day anguish washes over neckbeards simultaneously when they realize blockchain technology has been swallowed and manipulated beyond recognition by the financial services sector