In my mind, economics would predict the hashrate to halve as the reward halves. Essentially the argument would go if the price has not doubled the hashrate must fall."
I'm pretty sure that with auroracoin (or any other coin mainly mined by pools that mine altcoins in order of profitability) that this effect would happen really quickly, within a couple of blocks, too.
It's very different for Bitcoin, of course (there is no other coin to hop to). I don't share the belief expressed above that the halving had (will have) no effect on Bitcoin price. En contraire. But this is not the place to argue that.