Whether or not we should ultimately judge this process as a serious one or not depends on what happens yet. It is almost undoubtedly true that some of the Goldstone allegations will turn out to be relatively conclusively wrong. It is also almost undoubtedly true that some of the Goldstone allegations which Israel will be contesting in its report will still have legs. What we would hope to see, then, is Judge Goldstone (and the relevant UN bodies) taking precisely that stance -- withdrawing certain claims, and digging in on others. It doesn't have to be debasing; he could say something like the following:
"Based on the evidence presented in this report, I am satisfied that the events that transpired on X date in Y location were within the bounds of accepted military practice. We regret that it could not be included in our findings, but this evidence was not made available to the commission at the time of its report, despite our efforts to secure Israel's cooperation. We reiterate our disappointment that Israel did not participate in our inquiry; as this example indicates, their non-participation unfortunately barred the committee from ascertaining the fullest, most accurate account possible of the events in question."
I'm not sure whether Judge Goldstone will react to this -- I continue to believe there were at least some admirable qualities undergirding why he took on this mission, but there is no doubt he feels burned by the response and I suspect he believes a substantial amount of his international credibility now rests on defending his report to the death. This is his legacy, for better or for worse, and he will not be remembered well if his legacy is "that report which he later admitted wildly exaggerated Israel's culpability for war crimes" (by pro-Israel loyalists for issuing the report, by anti-Israel partisans for admitting its shortcomings). I guess we'll see. As for the relevant UN bodies, well, them I have no hope for, because for them this was never about fairness or human rights to begin with -- there is no reason to suspect they'll change that now.