Uniswap is a Dex exchange and polkadot is not, they aren't on same level as polkadot have a higher chance of surviving in the future,
I think OP want to mention Uniswap coin UNI here not Uniswap as a DEX exchange. During this bull run many new coins have been created such as DOT, SHIB, SAFEMOON. No one can say whether these coins will survive in the bearish market. However, I think UNI coin is more likely to survive. Because if ETH transaction fee is reduced, more tokens will be listed in Uniswap. As a result, the demand will increase and the chances of survival of UNI coin will increase.