I don't think that banks are starting to adopt bitcoins. What I know is that banks are looking for means to increase their earnings, means to continue keeping their customers, and ways to make sure that they fit in with the trends. Those are just what they are after; they are after what can come in their pocket and not what can benefit their customers.
 
What we should ask is: What are they bringing to the table that's not already theirs? The answer is nothing; they just want to make it seem as if they are giving their customers the best of service, making their crypto purchase easier, but what they are truly doing is taking their own little percentage from every purchase and withdrawal you make, making sure they track the address where you will send the crypto from your bank to, as that will be essential for them to use and track your privacy bridge. They can also tax you, as they can use any means possible to trace your crypto profit, so if you are asking me, I will tell you that banks are expanding their budget for milking their depositors.