This page doesn’t scale; it has already pushed past various MediaWiki limitations as it is. This should be only one possible “verification” badge for a tag.
Other indications of legitimacy could include inclusion in id-tagging-schema or usage by relevant data consumers. One can glean this information from taginfo as well, but it’s often quite difficult to find and software maintainers don’t always do a great job of declaring their support for tags.
On the other hand, we don’t want to unduly promote tagging for the renderer. And of course there’s the issue of circular reasoning as data consumers look to this status to decide what to support.