Why would Ethereum's value tank when it shall be switching entirely to PoS (the PoS chain is already up and running perfectly fine btw)? Ethereum shall also lo

Why would Ethereum's value tank when it shall be switching entirely to PoS (the PoS chain is already up and running perfectly fine btw)? Ethereum shall also lower the block reward, lower the fees, and make more people hold on to their ETH to get the staking reward. Why would the price tank? Also ETH is already at 1/2th the "market cap" of Bitcoin, so a takeover is definitely not unthinkable.