No matter what other protocol has come, POW remains the best and bitcoin has been the best decentralised and anonymous. Such was the vision and works of Satoshi that after so much of search of alternatives for decades , bitcoin still remains the best
POW is a bitcoin identity that cannot be replaced with POS. Because POW is clearly decentralized and POS is clearly centralized.
Like ETH turning from POS to POS. Bitcoin is still the best among altcoins and new projects are coming all the time.
Bitcoin is no longer in doubt.