Well, "De-Fi" is far from replacing banks anytime soon. The tech is still not mature enough for mainstream use. Even if it were, "De-Fi" won't be able to catch up with banks due to its limited adoption in the mainstream world. Banks are too powerful to go away even with the inception of crypto/Blockchain tech. As they get closer to adopt this revolutionary technology, "Ce-Fi" (centralized finance) will become bigger and stronger than ever. Because of this, I believe that "De-Fi" will only remain as an alternative than a replacement to traditional banks. I wouldn't worry about this as long as "De-Fi" works as intended. It's all about providing banking services to the "unbanked" people in a decentralized manner. "De-Fi" achieves exactly this by eliminating the middleman from the system. It may have its caveats, but it's bound to improve over time as the Blockchain space matures.

Nonetheless, there's no denying that "De-Fi" replacing banks is a dream. The only way it will become a reality is if central banks collapse in their entirety. But knowing that governments heavily patronize these financial institutions, it's very unlikely it'll happen anytime soon. Instead of focusing on replacing banks, let's work together in order to make crypto land a better place. As long as people have an alternative or "exit route" from the current monetary system, nothing else matters. Just my opinion