I wonder if Wikipedia could take an approach similar to what package managers do in Linux distros when they decide not to include non-free packages by default: savvy users must add external repositories containing the banned entities (with such a repository possibly being unofficial and externally hosted).
Perhaps this could be realized by letting logged in users fill out a field for sources of third-party domain records, each of which could be a source of domains across the entire Wikipedia site. Or, more simply, just flag certain domains as such, and silently require users enable something like HN's "showdead" bit.
Otherwise, if you look at the size of that talk page, trying to decide this once and for all brings to mind the idea that "hard cases make bad law".
Perhaps this could be realized by letting logged in users fill out a field for sources of third-party domain records, each of which could be a source of domains across the entire Wikipedia site. Or, more simply, just flag certain domains as such, and silently require users enable something like HN's "showdead" bit.
Otherwise, if you look at the size of that talk page, trying to decide this once and for all brings to mind the idea that "hard cases make bad law".