Ethereum's future depends on scalability and interoperability. While L2s and rollups improve efficiency, cross-chain communication remains a challenge. Current solutions (bridges, wrapped assets, and atomic swaps) have limitations. The best path forward includes trustless interoperability via LayerZero, Chainlink CCIP, and Ethereum’s EigenLayer. ZK-rollups will further enhance security and cross-rollup compatibility. Solving interoperability is key to Ethereum's dominance in a multi-chain world.