The fiat system is no good because it steals from people by allowing governments to print as much money as they want, that is why it's no good, however all of this hype about DeFi coins is just that hype and nothing more, those coins like most of the time do not offer anything that has not been present from the very beginning with bitcoin.

Bitcoin offers decentralized finances from the day it was created, every single person that has a bitcoin wallet becomes a bank and they can exchange their coins peer to peer without the need of any bank or any other third party, so if the future is actually going to be dominated by finances that are decentralized you can be sure that bitcoin is going to be a main competent of that future.