Stakers in a PoS system are incentivized to do what's best for the network. It wouldn't make sense for them to stake large amounts of funds and do something that could make Ethereum less valuable. The current marketcap of Ethereum is $325B, so a 51% attack in a PoS system means the attacker would need $165B. Even if a really bad attack occurred, the majority of validators can decide to fork (eg DAO fork). The social layer of Ethereum is a hidden force and I believe the majority are honest actors that would support any Ethereum improvement proposals that make the network more fair and decentralized.
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