I don't think any other platform will be able to compete with Ethereum in the future. That's because none can outmatch ETH's level of decentralization and censorship-resistance. BSC and Polkadot may be good smart contract platforms, but they're much more vulnerable to attacks and network disruptions than ETH itself. Decentralization is what really makes crypto stronger. I think ETH 2.0 will solidify ETH's position on the market, becoming a force to reckon with. Other platforms will simply remain as an alternative than a replacement because of the reasons mentioned before. At least, the competition is healthy. As long as each project contributes towards the development of Blockchain technology, nothing else matters. Just my thoughts