High gas fees, reduced popularity of DEFI, rapid decline of TVL on the chain, distrust of ETH2.0, criticism from miners, and restrictions on participants by the POS mechanism. Will the challenges of new technologies and new public chains cause ETH to decline rapidly?
High fees are a problem for a long time, and that didn't stop Ethereum to make a new price record! I guess we can find a lot of criticism coming from many sides, even though I stopped using Ethereum and all Ethereum DApps because I find some other chains a lot better, I don't think we will see Ethereum rapidly declining!
New technologies will be a challenge for many/all old projects, will they adapt or they will fade away we will see, it's something that nobody can predict!