DeFi will change the current financial system and will impact almost every conceivable contractual relationship. It's just getting started.
We often experience incredible societal change that replace one method of doing something with another.
These substantive shifts are usually ignored by the mainstream until the change becomes so normalised that almost everyone is using it.
Email replacing the letter is a prime example. So to was the adoption of the Internet and the use of the smart phone.
Decentralised Finance (DeFi) is another one, albeit in the very early stages.