I must agree with atheist that a block reward of 10% would scare away miners to a measly 10Mh...
at current price nyan is now not profitable, you mine with a loss ...
the reduction of 90% will lead to a 10x more loss to mine nyan (at current exchange rate).
only hope that the price will go up 10x will get the same mining power to the nethashrate. (many many people mine for profit not for fun).