Well, let's say some mining pool has taken over 51% of the network and can now manage your state as it wants, for example, change the chain that you have 0 coins, what do you say? Ethereum is not in vain switching to the pos algorithm, since it is impossible to do this on it .
It's hard to imagine that with how the mining ecosystem is pretty good at self-regulation to kick out bad actors. Larger miners can simply pool their share together to make sure the safety of the network and their own financial incentives are ensured. It's pretty safe to say that the time and money needed to perform such an attack on Bitcoin is useless at this point in time.
EOS is POS too, where some exchanges (Bitfinex was one of them) have already abused their voting rights. Ethereum will be a similar toy because of how most of the coins are held by centralized exchanges. People just like POS for its staking aspect, while everything else of negative nature is discarded because that's not of interest to them.
