I don't think shifting the %10 around is a good idea, but I don't necessarily think its a bad idea as well. Keep in mind that you are gonna be giving curation services being delegated millions of HP even more power this way. With the %10 increase in inflation, who's to say people who were raking in the %20 aren't gonna delegate their stacks to these services?
I would also add that this will probably affect coin distribution negatively, where blocktrades can pass a proposal almost single-handedly. This will give much more governance power to big holders, and fuck over small holders. My 2000HP stake getting a 1% extra due to inflation and someone holding a million HP getting 1% extra due to inflation is not really the same.
And I would say there is a conflict of interest aspect as well, since Witnesses get paid in Hive. So giving more to staked hive, basically means they are paying themselves more.
RE: Decreasing HBD APR and Posting Rewards and Increasing the Importance of Hive Power (HP)