The only viable reason to establish a "registry" of any kind is to identify a (small) group of like-minded individuals with similarly equipped vehicles. What is done with that information is nebulous and uncertain. My main point is that forming a registry to find out exactly how many of a specific car are still in existence is an exercise in futility. That goal will never be achieved. You'll never get all owners to respond. It will take years to get even a 2% response rate.
One way to make use of a large registry is in research. If the registry can be accessed to learn of differences and likenesses in a particular subgroup, that is a legitimate advantage for the owners and researchers. Getting a large group of respondents for such an endeavor is a very hard thing to achieve though. As has been mentioned, there is no harm in trying, as long as the volunteered information is safeguarded.
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