Right now a new account on STEEM costs 3 STEEM. I like the anti-spam account fee. As I said to implement a good REDPOS protocol would need a very well thought use of "reputational related parameters" (such as account age).

One use of the "account age" parameter is restricting an account based on age for the eligibility as a witness.

But the same parameter can be used to alter the "voting power" of every account. So essentialy an effective attack on the chain should take place if most of the chain is "corrupt", but if that happenes, then it is what most of the members of the "social blockchain" decided to be.

And we are talking about just ONE parameter that should be taken into account for such protocol. Ideally if well implemented, all the human related parameters that modify how that kind of blockchain operates should be balanced so as to turn any posible attack into an extremely costly one (in terms of money, time, preparation).

If STEEM should be forked and a "REDPOS" protocol is implemented on that NEWSTEEM, the fork could exclude accounts that are known to be just dormant or that currently are acting against the social blockchain (spam accounts, etc). So it would start "clean".