Isn't sha1-dc just checking for a small list of hard coded disturbance vectors? Meaning that script kiddies can't easily reuse exact values that researchers spent a bunch of time precomputing. That's far from being a good long term solution.
I'm not an expert on this but my impression is its a bit in the middle. It isn't a great long term solution, but finding new disturbance vectors is very hard. Its not like someone can just go find more on a whim.
