I expect gradual TPS increases as ETH upgrades step by step but as adoption of blockchains tech grows, Ethereum TPS will still not be enough to keep gas fees low. Sidechains and L2s like Polygon and Aurora/NEAR will do really well and so will the biggest AMM on each of those platforms because people will trade on these sidechains to reduce their fees and increase profits. Quickswap is the biggest AMM on Polygon and Ref Finance is the biggest one on NEAR protocol.