If the number of PoS coins continues to grow, then Bitcoin will be the only decentralized cryptocurrency in the world. Should I be worried? What are your thoughts about this? Your input will be greatly appreciated. Thank you.
I don't think that decentralization is much of an issue with PoS and people purport it to be.
In order to scale, you will have to inevitably give up some things and unfortunately decentralization is usually the first to go.
Each chain will simply serve a different purpose. For most PoW chains, their purpose is to be a currency/store of value. Whereas for PoS chains they are generally trying to be fast in transaction making and smart contracts, etc. Given the current market phase/focus it's not surprising.