I think that it's probably a very good idea to flag something like this, so people can identify experts when they need help. And it might be a good idea to have a tag for G2G (probably just "WikiData") that brings together all those people. This would be similar to the structure of an official project, without the a lot of the formal overhead.
I have no opinions, at all, about the content or management of WikiData genealogies. But I do think that having a process for aligning WikiTree with what is basically the default identification format for crowd sourced, cross-domain data management and integration, is a great idea. It's useful for profiles, and I find it useful for geographic categories, too.