What you are describing is a very pragmatic and logical solution. The problem is that at a technical level it is actually challenging to implement. The rewards pool does not actually contain STEEM coins. It is a virtual pool representing coins that haven't been created yet.

To actually implement the change would require another hardfork, which would take several weeks (possibly more than a month) to develop, test, and deploy.

It is a short term problem, and spending the developers time on this would pull them away from other changes that are intended to improve the platform in the long term. It would not be in the platform's best interest to spend time on this change.

People really should be less concerned with short term rewards, and focus more on how we can improve the platform to add value in the long term. Complaining about a temporary short term decline in rewards is counter productive to that IMO.