Excellent post! 

It brings another major concern of mine to mind, about content monetization on Steem based platforms:

Many kinds of content (like most videos found on YouTube today) increase in value to users over time – beyond the 7 day reward pool window. How recently a video or photo was posted is rarely the most important factor in deciding its worth to a viewer. The same can be said for many kinds of (usually) medium and long form written content. 

How can we design systems that balance rewards for quality content, freshness of content, proof of contribution to the network, and compounding value over the long tail of time?