That is putting things in perspective. I'd be interested to understand what economic incentives there are to attack the network. We could make some assumptions that the value of BTC drops to 0 after such an attack and therefore, value must be transferred outside the chain somehow. An easy way to make money would be to short BTC against fiat. The decision to attack would depend on the miner's current value of hardware (minus some resale value that might also drop) and future earnings from that hardware.