DeFi will continue but their trend will end in the next few years. Crypto will always be innovating all the time. Developers will always find interesting ideas for future Crypto developments. Nobody knows how Crypto will develop in the future but DeFi won't end.
DeFi has been on the market for several years, so we can't say that it will disappear. But recently, due to the hype around DeFi, their price has increased significantly, which attracted increased attention from investors. As soon as interest in such projects decreases, the number of investors will decrease, and therefore the price of tokens will decrease.