Does switching from POW to POS significantly reduce gas costs? And significantly improve TPS?
Why do you think ETHW failed?
If there is a new coin that tries to re-provide POW ETH, will you buy it?
I found several POW-based ETH altcoins released recently, do you think these altcoins have a future?
Bitnet:
https://bitcointalksearch.org/topic/ann-ethash-pow-bitnet-peer-to-peer-programmable-money-network-5459763
RETH:
https://bitcointalksearch.org/topic/annpow-rethereum-the-ethereum-proof-of-work-restart-project-ethashb3-gpu-web3-5462043
I think POS is a better option and they should have moved to POS earlier. Everything that's going wrong with Ethereum is not associated with it's choice of algorithm but with the development paths taken and the pace of improvements.
I don't think a POW fork of ETH would work, ETH blockchain is already a congested one and the market won't sustain two forks of similar ETH. I don't have high hopes for ETH either. They were a pioneer but newer coins are more capable as utility tokens than ETH.