I don't see Solana or Cardano being an ETH killer. As much as I like Charles Hoskinson, I've not seen him deliver on his promises. Solana on the other end might have a ton of benefits but the network is still unstable and time will tell how things will evolve. I agree with you, the fees on the Ethereum network are terrible but lets not forget one of the biggest benefits of the crypto bluechip ETH: it's time-tested.