Following up with this discussion, I'd like to get the community's opinion on whether you think we should allow questions that are overly broad, poorly defined, lack any real scope, and are essentially unanswerable in the way that they are formed.
I think, on the face of it, most veteran/expert users have no problem with closing these types of questions, as they lead to debate and personal, unsupported and opinionated discussion 95% of the time. That said, the questions themselves aren't necessarily impossible to answer; it's just unreasonable to conjure up an answer most of the time. For example, the question Can sport be an art? clearly fails to meet scope and definition criteria, but an answer could be provided that offered examples and readings of philosophy papers on art, definitions that some have used, some examples opinions of philosophers on sports, and a discussion as to whether sports meets the various definitions of the provided philosophers. It would really have to be a somewhat lengthy answer because the OP did not provide definition or scope, so the answer would have to provide that for them, in addition to an actual answer. As such, it would (by our current standards) fall under "cannot be reasonably answered in it's current form".
However, if the community was willing to step up and provide focus for the OP either by editing the question, or providing these lengthy answers required to adequately address questions like these, we might be able to find a way to allow these questions in the future. It really depends on the community, and how much you're willing to do. I can tell you though, it looks bad on the community (and the moderators) when we have tons of open questions like these which are never answered (or poorly answered). The self-evaluation we had a few months ago revealed some areas we could improve in, and allowing these types of questions without adequately handling them (either by the community stepping up to fix the question / provide a strong and thorough answer, or closing them) makes our site look sloppy and pushes us further away from our chances of getting out of Beta.
If you want my personal opinion, I honestly don't think we have a large enough or consistent enough userbase to have something like this work. We are growing, but we're not there yet. But since the question was raised I thought we could discuss it now with the people we do have, and perhaps revisit it in the future if we have to.