My thought has always been majority rule for downvotes...So random thinking, the majority people 'downvote' a post, then it gets a downvote. Would be pretty easy if it was spam for example, think the majority doesnt want that here...
No idea it it's feasible, cause I have the tech knowledge of a toad...But I know one thing, the more people don't feel valued, the harder it will be to keep them.
And that's really my thing..SBI was a way to make people feel their content is valuable.