Please bear in mind this is not close to being implemented.
That said, in the latest CTT it was mentioned about incorporating a Proof-of-Brain system on SpkNetwork that could enable rewards to go past 7 days.
In this video I discuss some aspects to the idea and how this is part of a larger concept of how Layer 2 is going to be a mecca for innovation. This idea is an example of something that changes Hive without affecting the base layer.
▶️ 3Speak