Adding more money to the rewards pool is all fine and dandy unless it is simply being consumed by people paying for votes and bots. So it could also take rewards away from content creators and consolidate it even further into bots and pay for vote approaches that damage the purpose of curation. It might not happen, and I hope it doesn't but it isn't guaranteed that puting curation rewards back into the rewards pool will go to people rather than just further consolidating into the pay to play brackets.

EDIT: And to be clear. I don't know of a way to prevent that from happening.