The decline of the rewards if followed by the rise of the price, will still sweet for new authors who want to get cool rewards from POB. We should be honest that the opportunity to earn is the major motivation of members who join POB. The main thing in my perspective is that the distribution of wealth. More people with the bigger wallet is ideal for POB. As we can see in hive there are only 30 whales in such a big platform.
When the distribution of wealth is large, there will be no monopoly of upvotes. More people will have their own power to encourage their circle of friends.
Nice point of view, @lebah.