I do not see how such a system would work. When users flag a topic as "Abusive", the mods still have to come onto the forums and delete the post anyway. How does that differ from what happens now?
Secondly, I seriously do not think the members of this forum can be fully trusted to decide who should be banned or not; that is why we have moderators. Currently we delete the topics and remove the user account.
I understand these posts are really, really annoying, but the moderators are doing everything they can to remove them.
And by the way, I didn't really understand why you needed a poll for this, so I deleted it for you