One interesting aspect to the delayed mechanism is it sort of gives a useful application for temporary lockup of Hive as per @tarakzp request: it's useful for Hive holders that want to make a profit by participating in support of the HBD peg.
Again, collateral as a staking opportunity isn't a new idea, BitShares had some of this same idea as well, although the implementation here is a bit different (and considerably simpler to implement from a blockchain and UI perspective).