I don't know why they bothered with even incorporating that 1 Zeit block rate tho, which of course leads me to another question:

If the network rate goes down to, say 10 MH/s, what's to stop someone with a huge rig setup from pointing their rig at the coin and doing a 51%+ attack with relatively little hash power? What is the network strength of the rest of the community's wallets?

Granted, they get nothing from the mining, but some people are malicious and do things "just to see if they can" (at other people's expense of course). Presumably I think it's the wallets that would make up the massive bulk of the network strength.