At first look, I like it.
I think perhaps there should be a decay type function added. I'm not thinking so much of the 'investment grade' stake accounts, but the hundreds of thousands of abandoned small stake accounts. Some form of activity every 6 months in order to receive the reward.
It's certainly worth considering and discussing. Thanks for the topic.
I like the decay part, make a blockchain action in x time to reset your decay timer, something along those lines.
Exactly that. Should slow some of the drag on the system.