Quite contrary to PoS, PoW is very hard or almost impossible to compromise. Not so for PoS, where more attack vectors can be found.
For example, PoS can be abused by rich stakers. Many PoS projects have a so-called pre-mining of coins allocated to the team and the team can abuse such pre-mined coins to gain influence about project decisions.
Based on a lot of different quantities out there bitcoin is quite unique ranging from its proof of work mechanism to decentralization. One thing I've come to understand is the fact that no matter how important and efficient decentralization is over centralization centralization will still exist and you just can't defy the fact that altcoins are there will continue to be created under a centralized system.
Let's weigh the odds in fact, what other cryptocurrency aside from bitcoin and probably monero was created without a primary drive to make profit off investors?