The SEC has come out to say that BTC and ETH 1.0 are most likely not violating US securities laws. By moving to proof of stake ETH has lost that stamp of approval. In addition some people argue that POS is violating security laws. Large institutions are far less likely to adopt a cryptocurrency that might run into legal trouble down the line.

https://www.invigorlaw.com/sec-says-cryptocurrencies-bitcoin... https://medium.com/blockchain-at-berkeley/does-proof-of-stak...