I hope other bank and investment firm will follow and with continuous growth of bitcoin adoption i'm pretty sure others would do the same even stock exchange in other country are offering crypto trading.
Frankly speaking, the Banks big wings should not be playing behind the scene because the government have tried many ways to infiltrate into the world of cryptocurrency, maybe they have something behind; that's yet to be reveal. We have seen some account be closed from Banks that discovered their client operating under cryptocurrency, the most recent case is that of the Bitpay among others.