I vote for keeping the limit. If a poster wants to gauge opinion on something be getting people to say simply yes or no, then they can add a poll to the topic.
What would be useful is the "Like" feature that this version of vBulletin has. I know the administrators are looking at other things since the forum upgrade, but hopefully it's on the list.
Beyond that, if someone is posting to say yes or no, then I'd like to know why they're saying that. It's part of being a discussion forum.