I miss the "No, it would cause high rate of inflation and fall in prices." option. Such an action would increase the coin output tenfold what would make even the current price unsustainable. Who would/could buy so many coins. It's only viable if the reward goes down to 2.1 BTC from 21 BTC.
In the discussion above it was proposed to change the block reward time at the next halving. The block reward would go from 12.5 BTC to 1.25 BTC. No change in coin supply. (I'd be dumping my coins ASAP if someone started jacking with the coin supply.)