https://www.bloomberg.com/news/articles/2016-12-21/who-owns-blockchain-goldman-bofa-amass-patents-for-coming-wars
It's in the best interest of banks to implement the technology, not necessarily the currency. Blockchain could save banks $20 billion per year:
http://www.coindesk.com/santander-blockchain-tech-can-save-banks-20-billion-a-year/
It'd be a huge disappointment to investors, but the possibility of bitcoin not taking over finance in the way that we think is very real. I guess it all comes down to the consumer; if they get on board with Bitcoin (which would probably require greater price stability), there's no question bitcoin will be much bigger than it is now.