There has to be a system that further rewards the Steemian to improve curation, content quality, and inversely remove junk, spam, and other non-value reducing activities like plagiarism, etc.

Education and long term investors are 1 way of doing it, the other way would be a system of rules that incentives like a half way between linear and some gradiant geometrical growth. Best would be a hybrid of both.

I would also propose the reward curve be dynamically calculated and proportion to the number prior day:

• x Active Users Daily (Upvoting, Posting, & Even Flagging) + Bonus % - Percentage of New User Joining Daily

Just my $0.02 SBD