Conventions—first articulated as guidance to authors and down-the-road enforced or badged as "certified!" by the Asset Store. Our group wastes so much time trying to make sense of each author's decisions when bringing an asset into our game. The software design principal of convention over configuration would save the community countless hours that could be spent on actually building games. Use and enforcement of conventions is something the entire Unity suite could benefit from, but it should start in the Asset Store since it has the biggest impact, seeing as the job to be done is coordinating thousands of autonomous people. Articulating and enforcing conventions within our own projects is something we all have more control over already since we own our projects—not so other people's assets. As for additional quality content, how about you strike a partnership deal with Sketchfab? They seem to have a large and talented authoring community.