Seems like it's mostly finished already. Some branches went all the way down to addresses with less than 30 BTC, while others stopped at over 2000 BTC. Can't really think of any reasonable logic behind it. Mark does seem to like random functions though, so maybe it just randomized how far each branch was divided.

Some branches like this are still going if someone wants to follow the money:
https://blockchain.info/address/1ASkFuM3ZNU7TPqHNuDTpJch22o5FRPXxS