STEEM community could turn from DPOS protocol to REDPOS protocol.
For example, no user could be elected as witness unless his account has a certain minimum age. Any other parameter that constitutes a "reputation" could be used on such a Reputation Enhanced DPoS , minimizing the posibility of a Justin Sun type of chain attack.
RE: Once Justin is Purged From Steem, I think Steem Should Adopt Telos Rules: No Exchanges Are Allowed To Vote on Blockchain