ETH without PoW algorithm is going to make the project lose its rank probably to Cardano, ETH without PoW algorithm is like a soldier without his bulletproof vest
Rank according to what?
Marketcap?
Popularity?
Price?
Decentralization?
Let's be honest. I am no fan of POS, but ETH proved to be quite revolutionary and is still a high ranked asset in most aspects, despite became a victim of its popularity via transaction fees.