The attack vector was institutions even after Congress passed the Gold reserve act in 1934.

What is the attack vector with Bitcoin?  State sanctioned torture police collecting private keys?  I don't think so. 

Bitcoin is kryptonite to tradfi.  The ETFs let Bitcoin walk right in tradfi's front door.  Bitcoin based tradfi products are the most toxic financial products ever created.  It's over.  

Not if.  When.