so if the most of the eth holders will reach to the point 32 eth will the ethereum price will collapse`?
It will not collapse. You should always remember about when people are staking their ethereum into the network and there will always be a 1 year locked period and that means the stakers will not able to get back their ethereum.
It's also mean that when more and more people are taking 32 ethereum from the market to be staked in the network and that will decrease circulating supply.
The price can be pumped easily rather than before.