I know the Geek Rankings show a game's accumulated ranking. I know the Hotness shows current trends of what's being viewed. Is there something in between, that shows views/posts/etc. of an item over time? (Akin to looking at page views for a website.)
The current system is not designed for this. However, if BGG had been built on top of something like Datomic (a db by Rich Hickey) you would be able to run queries against it as of any moment in time. The database never loses any data even in the case of updates and deletes. It presents a perfect picture as of any moment in time.