I has the potential to do so, and many high profile figures think the same, but if that ever happens it would be in decades from now. Probably only after the world experienced some great crash again, or more than one. Before that, I do think banks will use blockchain to compete with Bitcoin, or to try to send the message that we don't need BTC to have fast transactions. The thing is, that BTC wasn't created to just speed up transactions. It was created to be a decentralized currency, with all the advantages that brings. Of course governments probably wont like that a lot, and banks will definitely hate it, so it will be hard for that switch to happen. I think think we will first just see BTC as an "improved PayPal". Only after it succeeds as a payment system, it can aspire to become something more.