Decide on what? They are not governing the protocol or restricting who can use it, only proposing blocks and submitting attestations. They have limited capabilities to make changes in the ledger, and if they do enact undesirable changes they risk their capital being slashed. If you as a user wants to participate in protocol validation and its rewards without staking 32ETH, you can use a decentralized staking pool like RocketPool.

As of yet there are no sound methods of securing a public ledger without either PoW, PoS or PoA. Bitcoin uses PoW, most central banking and traditional payment processors use PoA, Ethereum will soon use PoS.