What will happen when there are a bunch of legendary accounts.
There will be a lot of Legendary accounts?
Theymos has said in the past that he was considering creating a rank over Legendary, so perhaps something similar to that could be implemented in the future. Considering that there are still <1,000 of such accounts however, and only a certain amount of those are active, I don't think there is a dire need for such.
Maybe there should be also a Post quality qualifier for activity.
This is close to impossible as there isn't a way for a machine to accurately judge post quality, so it would likely require manual approval. This would be unnecessary work for the staff for such an insignificant change.