Too soon to tell, on paper DeFi should be able to almost completely take the place of traditional centralized finance, but when it comes to real world use and practice things could change and it's normal to see some issues that we were not able to notice in theory, I think that DeFi is really the future and it's not going to go away but I believe its current form will/should change and get better in some minor details, and don't ever forget some of what you're seeing right now is pure hype so don't get too much invested in DeFi now and wait for its hype to cool down a bit before any kind of investment in this area, DeFi implementation by large is a very long process and is not going to happen overnight.