Yes, it's an interesting topic. Ethereum is a strong platform, but it has its own problems: slow transactions, high fees and scalability issues. So some projects want to fix this, and the
best ethereum killers are those blockchains that offer the same functions, but faster and cheaper. Solana, Avalanche, Near, Polkadot are all moving forward. But for now, they are more complementary to Ethereum than completely replacing it.