Today, there are already a certain number of banks that offer their services in the form of Bitcoins. I think that their examples will be followed by many, but yesterday's dream has become a reality
It is good to see that there are some services that uses Bitcoin blockchain technology, they want to improved their technology. I don't think banks would support bitcoin, its price is not stable and very unpredictable.
Some of the instruments allow investors (and banks as intermediary agents) to make profit exactly from that: that the price is unpredictable and unstable. Future contract for instance are one of them and it may be the reason that bitcoin future contracts has been embraced by banking community.