While bitcoin is certainly the first thing that people think of when they think cryptocurrency, I don't understand why banks are not looking at so many other options - there are so many other interesting projects that deserve attention and where there is potential for growth. We already see many crypto funds coming up to drive investments in ICOs and cryptocurrencies so banks will probably be a little late to the game but nevertheless they will eventually come.
We will have to see how governments in turn regulate the banks from dealing in cryptos; it will not be a easy path I suppose.