Ad impressions will drop by 50% or more. CPM's will increase commensurately. ComScore 500 publishers will finally get the respect they deserve and recapture market share from their junky ad network rivals. Consumers will start noticing – dare I say liking? – display ads. Display will no longer be the red headed stepchild in the shadow of direct response rival search or brand rival video. That's what we can look forward to in a world ruled by the viewable impression standard. Why am I on my high horse about viewable impressions? And why do I think it's such a big deal for the industry? Well, we in the display advertising world have a real problem, and it's been plaguing us since the earliest days of the medium: how to think about,…