It would have to be a 'grass-roots' campaign to ask the developers to code premium content
and we would still have our favorites and followers, but, spammer and the like would not be able to comment on our posts.
In fact, I would happily put up a deposit to prevent spammers from commenting on my posts. And unless I specifically follow someone, then they would either to have the same deposit or level of steem power in their wallet in order to leave a comment. Something as small as 25 sbd would cut spammers by a large percent. Have a look at how much Steem a spammer holds.