Speedie, jimlite, IPBC devs - the actual answer is this:

1. Hard-fork back to the original 10,000 block reward
2. Move decimal place over to avoid sub-one-satoshi coins (look into how IOTA did this)
3. All miners who mined 400 coins per block after the "fix" should be given (through a hard-fork) an additional 9,600 coins per block to the output address in their coinbase transaction
4. Continue mining 10,000 coin blocks as if nothing happened

This is the only way to fix this problem and return everything to normal.

Every other solution proposed has terrible trade-offs and edge cases except for this one.