The first time I heard you say we should do away with blogging rewards, I thought that would be the death of Hive.blog. Now I see what you're talking about. By transferring the value, and the judgment of it, to the communities, new users to the blockchain could join a community the moment they set up their account. With the 3 types of communities, anyone on the blockchain could join or start a community of any of those three types. If each community distributed its own rewards by either creating a Layer-2 token or using one already on the market, then all types of content could still be rewarded.
On staking, HIVE could always transition into a governance token where anyone on the blockchain could trade Layer-2 tokens for HIVE to increase their governance stake. The staking mechanism wouldn't necessarily need to change. Although, there may not be a need for HBD anymore.
How would the overall reward pool be distributed to the communities? According to the number of subscribers, to the number of active subscribers? To the number of posts? To the number of quality posts?
Each community would decide that for themselves.