I think the bitcoin implementation can cut the costs to the banks. So they might embrace it.
The banking system was designed that way, It's evil. They don't care about the people, and they don't care about the costs as long as they can enslave us. Bitcoin represents everything that the banks are against, they simply can't work together. If they can't stop it or control it, then we will see some laws in the future that prevent us from using it which clearly mean that some exchange will be shutdown etc. but that won't stop anyone from using it since that's what the decentralization was meant for.