Maybe? Does it even need a future to exist? It'll be fully regulated by the government, so it's likely that they'll be regulating the price as well. I don't know how they're going to work, but I simply imagine them as digital fiat. It wouldn't matter if no one is using them, they're still going to retain their value.
I personally think that's pointless, because as someone else mentioned, transacting with a credit card is likely just as easy. Granted, you won't have to pay annual fees and the like, but I don't feel like it will make a huge difference. They're going to have to offer incentives for using them because it would be cheaper in the long run, not needing special machinery and raw materials to produce.
You want to say that banks will begin to lower rates on loans, and so they are now struggling with cryptocurrency?