As to whether the mission was accomplished, I would say "to some extent." I don't think that there was ever a danger that figure skating would be kicked out of the Olympics, but the judging scandal did cause embarassment to the IOC and they leaned on the ISU to "do something." (Actually, from the IOC's point of view, the judging scandal was a blessing in disguise in that it diverted attention from the
real scandal of the Salt Lake City games, namely bribery and corruption within the IOC itself, along with the USOC.
en.wikipedia.org
If the goal of the IJS is to reduce subjectivity and to advance "measurability," again I would say that it has been partially successful. GOEs, for instance, remain a problem. An average run-of-the-mill quad should get a score of 0 GOE, just like an average run-of-the-mill anything else. But in reality a successful quad always gets positive GOE, and a successful quad by a skater wioth a big reputation gets sky-high GOE. Hey, it's a QUAD!!! But is has already been rewarded (in the base score) for being a quad.
But now we are back to square 1. Is it a beautiful quad, is it an eshetically pleasing quad, is it an artistic quad, does it support the flow of the choreography and match the structure of the music? Or is it just, "throw a cat out ugly and see if it lands on its feet?" I would hate to abandon such considerations as irrelevant from a sporting perspective.