This means that playing darts is less about timing and more about luck (unless I ordered by receipt, in which case it's ordered first by timing and then by proximity in the network.) You could probably run a lotto doing this without any outside randomization.
Interesting. I don't think it would work though if the jackpots got really big. Once it does it can be assumed that some miners may try to cheat. A miner with a lot of power may try to skew things in their favor.