Being a proof of stake doesn't change that much with its use case. Many projects still uses it and I think that the foundation that it has set has made it even better. The use cases were never gone and it's still good as it was. The dominance that it has got in the altcoin market is still good. And no matter what we see on it that it's getting better, I agree that it still needs Bitcoin when it moves. Because without it, we'll mostly seeing another affection that it has got directly and the movement of it will be slower.
There were lot of expectations that moving from PoW to PoS will bring lots of improvement in Eth that will result in it's price but that never happened. Moreover the Ethereum coin supply in circulation has also not not gone down rather
gone up which is a big question mark on efficiency of PoS consensus algorithm. It's a good opportunity for people who have bought Ethereum at lower prices and buying Ethereum at current price is not recommended because Ethereum is very much dependent on Bitcoin price for bull run