That would entail a significant redesign of the underlying display engine... and an agreement of that being the correct direction at the corporate level.

Unfortunately, after Jeff left I don't think there was that much upper management level support for "quality before quantity" After the sale it feels like it was "quantity and engagement will follow" and then "engagement through any means". Deleting and hiding questions or answers that aren't high quality... really would mean making most of the site hidden and that wouldn't help engagement at all.