I think that all this hype about defis is gonna pass in some time. Uniswap has a great user interface and I'm sure it is gonna keep its popularity even when defis fever will pass)
Hopefully it won't happen like you said because if that happens it will make a lot of people lose, because now I see a lot of trading on uniswap hopefully an exchange like uniswap can last a long time and become famous because many are using it like the Binance exchange.