Usually, block halvings tend to lead to price increases later due to lower inflation rate, and lower total supply on the market.
It will be the same as bitcoin halving but it will reduce the coin that will have produced by the miners to be dumped to the market. basically, it will decrease the inflation that caused by the miners.
that's so simple to understand.
In contrast, switching to PoS is too risky due to more coins will be spread out to more weak hands.
By saying 'weak hands', I meant small stakers who tend to dump their rewarded coins from staking process.
But, it is just a theory and common scenario.
Let's see what's happen with the specific case of Ethereum when it switch to PoS.
Technically speaking it gives an equal chance and opportunity for all to stake and get rewarded, before switching to PoS only miners can earn by mining eth, rest of people who don't have a clue or cannot mine will result to buy eth and still you get nothing for hodling in your wallet whatsoever,
Now the story is different, instead of having idle eth in your wallet, stake it and get rewarded, price will always be affected either way,
other coin/token without POS or POW still have their price affected, demand and supply will determine the price, bottom-line now is soon pos will be available to all and people can make decision to stake or not, i don't see the risk here.