Possibility of a serious security issue on launch of ethv2?

Hi everyone, I'm quite curious about how the ethv2 launch will go. The reason being that a lot of eth locked in v2 has probably gotten worth more and thus more reason for people that staked their eth to take profit. Another reason is that other people might think this too and will take precautions around the time PoS drops, supposedly causing the price to drop leading up to and after PoS. The only way I see is for eth to be worth lot less when PoS drops, so people who staked will not be tempted to take it out. The security issue would come in where there will be less eth staked and thus less validators, making it easier to perform a 51% attack.

Thoughts?